中国化学快报

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Synthesis and characterization of a novel series of unsymmetrical porphyrins

Lei Wang, Ya Qing Feng, Jin Qiang Xue, Nai Kun Hu

中国化学快报. 2007, 18(09): 1021-1024. https://doi.org/10.1016/j.cclet.2007.07.021

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A novel series of unsymmetrical porphyrins with aldehyde group at the terminal of the linkage which connected to meso-phenyl through acylamide bond have been synthesized and structurally characterized by IR, ¹H NMR, MS, UV-vis, fluorescence.

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5-Hexylidene-4-propylamino-1,5-dihydroimidazol-2-one formed from Cu-catalyzed oxidation with implication for the structure of a His-Lys cross-link

Ming Liang Ma, Xiao Yan Li, Ke Wen, Yahu A. Liu

中国化学快报. 2007, 18(09): 1025-1028. https://doi.org/10.1016/j.cclet.2007.06.025

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Cu-catalyzed oxidation of 5-hexyl-1, 3-dihydroimidazo-2-one (1) in the presence of propylamine, as surrogates for the oxidized His side chain and Lys side chain, was investigated. 5-Hexylidene-4-propylamino-1, 5-dihydroimidazol-2-one (2), a model His-Lys cross-link product, was isolated and structurally characterized by NMR and mass spectrometry.

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Triphenylphosphine-catalyzed isomerization of alkynyl ketones in aqueous solution

Qing Fa Zhou, Fei Yang, Qing Xiang Guo, Song Xue

中国化学快报. 2007, 18(09): 1029-1032. https://doi.org/10.1016/j.cclet.2007.06.024

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An efficient isomerization of alkynyl ketones to (E, E)-diene ketones was developed. The reaction catalyzed by 20 mol%triphenylphosphine in aqueous media gave the desired products in good yields.

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Cu-catalyzed arylation of phosphinic amide facilitated by (±)-trans-cyclohexane-1,2-diamine

Juan Li, Song Lin Zhang, Chuan Zhou Tao, Yao Fu, Qing Xiang Guo

中国化学快报. 2007, 18(09): 1033-1036. https://doi.org/10.1016/j.cclet.2007.07.028

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Cu-catalyzed cross coupling between phosphinic amides and aryl halides was accomplished for the first time by using (±)-trans-cyclohexane-1, 2-diamine as the ligand. This reaction provided a novel approach for synthesizing arylated phosphinic amides. Both kinetic measurement and theoretical calculation indicated that phosphinic amides were much less reactive than amides by about 10times in Cu-catalyzed cross coupling.

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A new efficient route for the synthesis of 4,4',6,6'-tetra (azido) azo-1,3,5-triazine

Xiao Tong Li, Sheng Hua Li, Si Ping Pang, Yong Zhong Yu, Yun Jun Luo

中国化学快报. 2007, 18(09): 1037-1039. https://doi.org/10.1016/j.cclet.2007.06.028

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A new method for the synthesis of 4, 4', 6, 6'-tetra (azido) azo-1, 3, 5-triazine (TAAT) is described. The key intermediate 4, 4', 6, 6'-tetra (azido) hydrazo-1, 3, 5-triazine (THAT) was synthesized by nucleophilic substitution in the case of sodium azide as nucleophile. N-Bromosuccinide (NBS) was used as oxidant to oxidize THAT by a tractable operation under mild reaction condition. The target compound TAAT was obtained with a facile process and high overall yield of 81%. The structures of TAAT and its intermediates were identified by spectroscopic methods.

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Copper-mediated 1,4-conjugation reaction of functionalized alkylzinc iodides with derivatives of β-nitrostyrene

Dan Feng Huang, Yu Lai Hu, Jin Xian Wang

中国化学快报. 2007, 18(09): 1040-1042. https://doi.org/10.1016/j.cclet.2007.06.017

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Functionalized alkylzinc iodides will undergo 1, 4-conjugation reaction with derivatives of β-nitrostyrene in the presence of Cu (Oac) ₂/LiCl to afford a polyfunctional nitro-compound in high yield.

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Palladium-catalyzed homo-coupling of boronic acids with supported reagents in supercritical carbon dioxide

Lei Zhou, Qiu Xiang Xu, Huan Feng Jiang

中国化学快报. 2007, 18(09): 1043-1046. https://doi.org/10.1016/j.cclet.2007.06.023

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Palladium-catalyzed homo-coupling of arylboronic acids could proceed smoothly with a commercially available resin functionlised by phosphino or amino group as the ligand in supercritical carbon dioxide thereby offering a simple and efficient protocol for the synthesis of symmetrical bi-aryl molecules and their higher homologues.

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One-pot synthesis of 2,5-disubstituted-l,3,4-thiadiazoles under ultrasonic irradiation

Ying Jun Li, Ya Zhen Sun, Yong Ting Xu, Kun Jin, Li Ping Wen, Ni Bo Hou, Xiao Xiao Sun

中国化学快报. 2007, 18(09): 1047-1048. https://doi.org/10.1016/j.cclet.2007.05.049

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A facile one-pot synthesis of 2, 5-disubstituted-1, 3, 4-thiadiazoles was achieved by ultrasonic irradiation of a mixture of lnaphthylacetyl chloride, NH₄CNS, CH₂Cl₂ and PEG-400 for 1.5 h at 10-20℃ and subsequent irradiation for 1.5 h in the presence of N-arylglycine hydrazides. This method requires short time and gives thiadiazoles in high yields.

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Preparation of natural isovaleraldehyde by the Maillard reaction

Hong Yu Tian, Jie Zhang, Bao Guo Sun, Ming Quan Huang, Jian Rong Li, Xiao Xiang Han

中国化学快报. 2007, 18(09): 1049-1052. https://doi.org/10.1016/j.cclet.2007.07.009

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Isovaleraldehyde possesses malty, fruity, cocoa-like odor and is widely used in fruit, chocolate, coffee flavors. The preparation of natural isovaleraldehyde by the Maillard model reaction was studied in this paper. The effects of the ratio of D-glucose/L-leucine, reaction temperature and pH value on the yield of isovaleraldehyde were explored. The optimum conditions were as follows:n (D-glucose):n (L-leucine)=4, temperature 150℃, reaction time 3 h, pH 5. The highest yield of isovaleraldehyde obtained was about 32%.

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Selective oxidation of ethylbenzene catalyzed by fluorinated metalloporphyrins with molecular oxygen

Xiao Gang Li, Jing Wang, Ren He

中国化学快报. 2007, 18(09): 1053-1056. https://doi.org/10.1016/j.cclet.2007.06.019

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This paper reported the oxidation of ethylbenzene catalyzed by fluorinated metalloporphyrins under mild conditions without any additives. The results showed that the cobalt (Ⅱ) (5, 10, 15, 20-tetrakis (pentafluorophenyl)) porphyrin was the best catalyst among the fluorinated metalloporphyrins. The conversion of ethylbenzene reached 38.6%, the selectivity to acetophenone reached 94.0%, and the turnover number is 2719 under the optimal conditions.

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Ruthenium (Ⅲ) chloride as an efficient catalyst for the synthesis of perimidine derivatives under mild conditions

Jing Zhang, Song Lin Zhang, Jun Min Zhang

中国化学快报. 2007, 18(09): 1057-1060. https://doi.org/10.1016/j.cclet.2007.07.004

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可视化

Various biologically important perimidine derivatives have been synthesized efficiently from various ketones and naphthalene-1, 8-diamine by using a catalytic amount of RuCl₃ (1 mol%). This method is a very simple and high yielding reaction for the synthesis of perimidine derivatives.

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Indium-mediated allylation of aryl trichloromethyl ketones in aqueous media

Zhi Jian Bao, Jun Lu, Shun Jun Ji

中国化学快报. 2007, 18(09): 1061-1063. https://doi.org/10.1016/j.cclet.2007.07.035

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It is described that indium-mediated allylation of trichloromethyl ketones could afford the corresponding homoallylic alcohols smoothly in aqueous media.

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Wet carbon-based solid acid/NaNO₃ as a mild and efficient reagent for nitration of aromatic compound under solvent free conditions

Arash Shokrolahi, Abbas Zali, Mohammad Hossein Keshavarz

中国化学快报. 2007, 18(09): 1064-1066. https://doi.org/10.1016/j.cclet.2007.06.031

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Nitro aromatic compound can be obtained in high yields via nitration of aromatic compound with wet carbon-based solid acid and NaNO₃ under solvent free oxidation at room temperature.

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K₂CO₃ catalyzed solvent-free synthesis of molecular tweezers containing chiral unsymmetrical urea unit under microwave irradiation

Zhi Gang Zhao, Xing Li Liu, Cai E. Zhou

中国化学快报. 2007, 18(09): 1067-1070. https://doi.org/10.1016/j.cclet.2007.06.030

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A facile, rapid and efficient method for the synthesis of molecular tweezers containing chiral unsymmetrical urea unit in solventfree conditions using microwave was reported.

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Synthesis and surface activity of a novel heterodouble chained N-acyltaurate amphiphile

Feng Yan, Zhi Cheng Xu, Qing Tao Gong, Zhi Qiang Jin, Jing Yi An, Sui Zhao, Jia Yong Yu

中国化学快报. 2007, 18(09): 1071-1074. https://doi.org/10.1016/j.cclet.2007.07.005

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A novel double chained amphiphile, N-(α-4-hexylphenoxy)-lauroyltaurate (abbreviated as 10+6B-T), has been synthesized. The structures of main intermediate products and the title product were characterized by ¹H NMR. The new amphiphile shows high surface activity. The critical micelle concentration (cmc), which is 1.1×10^-5 mol/L, is much lower than that of conventional double chained surfactants, such as sodium bis (2-ethylhexyl) sulfosuccinate (AOT).

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Two new α,β-unsaturated butyrolactone derivatives from Pleione bulbocodioides

Xin Qiao Liu, Wen Yuan Gao, Yuan Qiang Guo, Tie Jun Zhang, Lu Lu Yan

中国化学快报. 2007, 18(09): 1075-1077. https://doi.org/10.1016/j.cclet.2007.06.022

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Two new α, β-unsaturated butyrolactone derivatives, 4-(4"-hydroxybenzyl)-3-(3'-hydroxy-phenethyl) furan-2 (5H)-one (1) and 3-(3'-hydroxyphenethyl) furan-2 (5H)-one (2), together with one known phenolic compound (3), were isolated from the tubers of Pleione bulbocodioides (Franch.) Rolfe. Their structures were elucidated by analysis of spectroscopic data.

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A new triterpenoid saponin from Clematis ganpiniana

Feng Sun, Qing He, Pei Gen Xiao, Yi Yu Cheng

中国化学快报. 2007, 18(09): 1078-1080. https://doi.org/10.1016/j.cclet.2007.06.026

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A new triterpenoid saponin, named clematiganoside A (1), was isolated from the whole plant of Clematis ganpiniana. Its structure was elucidated on the basis of 1D, 2D NMR, TOF-MS and ESI-MS techniques, and physicochemical properties.

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A new cyclodipeptide from the cultures of Geotrichum candidum

Ya Nan Liu, Jing Hua Xue, Na Feng, Ping Wu, Xing Zhong Liu, Xiao Yi Wei

中国化学快报. 2007, 18(09): 1081-1083. https://doi.org/10.1016/j.cclet.2007.07.003

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A new cyclodipeptide, cyclo (phenylalanyl-N-methyltyrosyl) 1, was isolated from the mycelial solid cultures of Geotrichum candidum. Its structure was elucidated by spectroscopic methods. The antifungal activity of the new compound against Peronophythora litchii was assessed by microplate Alamar blue assay (MABA).

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Two new indole alkaloids from Nauclea officinalis

Jing Yong Sun, Hong Xiang Lou, Hui Xu, Sheng Jun Dai, Ke Liu

中国化学快报. 2007, 18(09): 1084-1086. https://doi.org/10.1016/j.cclet.2007.07.006

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Two new indole alkaloids, 4-oxo-4, 12-dihydroindolo[2, 3-a]quinolizine-3-carbaldehyde (1) and 1, 6, 7-trihydro-indolo-[2, 3-a]furan[3, 4-g]quinolizine-3, 4 (13H)-dione (2), were isolated from Nauclea officinalis. Their structures were determined on the basis of 1D and 2D NMR spectral data.

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A phenolic glycoside from Fagopyrum dibotrys (D.Don) Hara

Zheng Zhong Bai, Xiao Hui Zhang, Li Jiang Xuan, Feng Kui Mo

中国化学快报. 2007, 18(09): 1087-1088. https://doi.org/10.1016/j.cclet.2007.07.033

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A new phenolic constituent along with five known compounds were isolated from Fagopyrum dibotrys (D. Don) Hara. The new compound was characterized as 1, 3-dimethoxy-2-O-β-xylo-pyranosyl-5-O-β-glucopyranosyl-benzene, by spectroscopic analysis and enzymatic hydrolysis.

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A new phenanthro[2,3-b]furan from Pleione bulbocodioides

Xin Qiao Liu, Wen Yuan Gao, Yuan Qiang Guo, Tie Jun Zhang, Lu Lu Yan

中国化学快报. 2007, 18(09): 1089-1091. https://doi.org/10.1016/j.cclet.2007.07.011

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A novel phenanthro[2, 3-b] furan 1, named (3-hydroxy-9-(4'-hydroxy-3'-methoxyphenyl)-11-methoxy-5, 6, 9, 10-tetrahydrophenanthro[2, 3-b] furan-10-yl) methyl acetate, and two known phenolic compounds were isolated from the tubers of Pleione bulbocodioides (Franch.) Rolfe. Their structures were elucidated by spectroscopic methods.

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A new isoflavane from processed Astragalus membranaceus

Wei Liu, Jing Chen, Wen Jian Zuo, Xian Li, Jin Hui Wang

中国化学快报. 2007, 18(09): 1092-1094. https://doi.org/10.1016/j.cclet.2007.07.036

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A new isoflavane named astraganoside, together with five known compounds had been isolated from the processed Astragralus membranaceus. The structure of the novel compound was elucidated as (3R, 4R)-3-(2-hydroxy-3, 4-dimethoxyphenyl) chroman-4, 7-diol-7-O-β-D-glucopyranoside (1) based on spectroscopic methods including UV, IR, ESI-MS, 1D NMR and 2D NMR techniques.

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A novel method for Co (Ⅱ) and Cu (Ⅱ) analysis by capillary electrophoresis with chemiluminescence detection

Xiao Ming Guo, Xiang Dong Xu, Hui Jing Zhang, Yong Gang Hu, Jie Zhang

中国化学快报. 2007, 18(09): 1095-1098. https://doi.org/10.1016/j.cclet.2007.06.015

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Based on the fact that some metal ions can catalyze the chemiluminescence (CL) reaction of luminol with K₃Fe (CN) ₆, a novel capillary electrophoresis CL method was developed for the determination of Co (Ⅱ) and Cu (Ⅱ). The separation was carried out with a 10 mmol/L sodium acetate solution containing 0.8 mmol/L luminol and 2.0 mmol/L α-HIBA (adjusted to pH 4.8 by Hac solution). The post-capillary reagent was 2.0 mmol/L K₃Fe (CN) ₆which was adjusted to pH 13.0 by NaOH solution. Under the optimum conditions, the detection limits (S/N=3) for Co (Ⅱ) and Cu (Ⅱ) were 7.5×10^-11 mol/L and 7.5×10^-9 mol/L, with the linear range of 7.5×10^-9 mol/L to 1.0×10^-6 mol/L and 7.5×10^-8 mol/L to 5.0×10^-5 mol/L, respectively.

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Determination of sodium hyaluronate with some basic bisphenylnaphthylmethane dyes by resonance Rayleigh scattering method

Lian Hui Chen, Yi Jian, Hong Qun Luo, Shao Pu Liu, Xiao Li Hu

中国化学快报. 2007, 18(09): 1099-1102. https://doi.org/10.1016/j.cclet.2007.06.020

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In an acetic acid-sodium acetate buffer solution of pH 3.6-6.8, a compound complex was formed between sodium hyaluronate (abbreviated as SH) and some basic bisphenylnaphthylmethane dyes, leading to a great enhancement of the intensity of resonance Rayleigh scattering (RRS) and giving a new RRS spectrum, with its maximum scattering peak near 280 nm. It was also found that the intensity of RRS was directly proportional to the concentration of SH near the range between 0 and 3.0 mg/L. Based on these facts, a sensitive method for the determination of SH has been established. The method had good selectivity, and has been used for the determination of total amounts of SH in samples with satisfactory results. For the NB-SH system, the detection limit of SH was down to 13.7 ng/mL.

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Potentiometric determination of diclofenac in pharmaceutical formulation by membrane electrode based on ion associate with base dye

Zholt Kormosh, Iryna Hunka, Yaroslav Bazel

中国化学快报. 2007, 18(09): 1103-1106. https://doi.org/10.1016/j.cclet.2007.07.007

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The characteristics, performance and application of membrane electrode based on ion associate of diclofenac with base dye Safranine T are described. The electrode response to diclofenac has the sensitivity of 47±1.0 mV decade^-1 over the range of 5×10^-5 to 5×10^-2 mol/L at pH 6-12, and the detection limit of 3.2×10^-5 mol/L. The electrode is easy assembled at a relatively low cost has fast response time (2-4 s) and can be used for a period up to 3.5 months without any considerable divergence in potential. The proposed sensor displayed good selectivity for diclofenac in the presence of different substances. It was used to determine diclofenac in pharmaceuticals by means of the standard addition method.

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Development of ELISA and immunochromatographic assay for ofloxacin

Wu Yong Sun, Wen Ying Liu, Ling Bo Qu

中国化学快报. 2007, 18(09): 1107-1110. https://doi.org/10.1016/j.cclet.2007.07.008

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Two rapid, sensitive and reliable immunoassay methods, namely competitive indirect enzyme-linked immunosorbent assay (CIELISA) and colloidal gold-based immunochromatographic assay (CGIA), were developed to detect ofloxacin (OFL). The linear range of the CI-ELISA was from 0.5 to 128 ng/mL with a limit of detection (LOD) of 0.35 ng/mL. Good recoveries were obtained in analyzing simulated swine urine samples. The CGIA could accurately estimate OFL at concentrations as low as 10 ng/mL in less than 10 min, and test results were read visually without any instrument.

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Voltammetric determination of uric acid by using gold nanotubule electrode

Yue Rong Wang, Ping Hu, Qiong Lin Liang, Guo An Luo, Yi Ming Wang

中国化学快报. 2007, 18(09): 1111-1114. https://doi.org/10.1016/j.cclet.2007.07.034

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Gold nanotubule membranes were prepared by using electroless deposition of gold within the pores and surfaces of polycarbonate track-etched membranes. And the gold nanotubule membrane was used as an electrode for determination of uric acid in urine samples for the first time. In Britton-Robinson buffer of pH 4.56, uric acid exhibited well-defined differential pulse voltammograms. And the interference between coexistent ascorbic acid and uric acid was overcome owing to the attractive ability of the gold nanotubule electrode to yield a large anodic peak difference ca. 0.404 V (vs. SCE). The proposed method was then applied to the determination of uric acid in urine without any pretreatment.

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Calcium-binding ability of soy protein hydrolysates

Xiao Lan Bao, Mei Song, Jing Zhang, Yang Chen, Shun Tang Guo

中国化学快报. 2007, 18(09): 1115-1118. https://doi.org/10.1016/j.cclet.2007.07.032

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This present study investigated the ability of various soy protein hydrolysates (SPHs) in binding calcium. It was demonstrated that the amount of Ca-bound depended greatly on the SPHs obtained using different proteases, which included:neutrase, flavourzyme, protease M and pepsin. The maximum level of Ca-bound (66.9 mg/g) occurred when protease M was used to hydrolyze soy protein. Peptide fragments exhibiting high Ca-binding capacity had molecular weights of either 14.4 or 8-9 kDa. The level of Ca-bound increased linearly with the increment of carboxyl content in SPHs, and further deamidation on SPHs from protease M improved Ca-binding of the hydrolysate.

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Synthesis and phosphorescent properties of two novel iridium (Ⅲ) complexes bearing bulky tert-butyl substituents

Rong Huang, Xiao Qiang Wei, Tai Ping Zhang, Zhi Yun Lu, Ming Gui Xie

中国化学快报. 2007, 18(09): 1119-1123. https://doi.org/10.1016/j.cclet.2007.06.008

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The synthesis and phosphorescence properties of two novel Ir (Ⅲ) complexes bearing tert-butyl substituents, bis (4-tert-butyl-2-phenylbenzothiozolato-N, C^2') iridium (Ⅲ) (acetylacetonate)[(tbt) ₂Ir (acac)] and bis (4-tert-butyl-1-phenyl-1H-benzimidazolatoN, C^2') iridium (Ⅲ) (acetylacetonate)[(tpbi) ₂Ir (acac)], are reported, their molecular structures are confirmed by ¹H NMR, ESI-MS and elementary analysis. Photoluminescence (PL) studies revealed that they can emit strong green and orange phosphorescence in high quantum yields. Compared to their prototypes lacking of tert-butyl substituents, the two novel iridium (Ⅲ) complexes both have shorter lifetimes and improved or nearly similar PL quantum efficiencies, implying that the exciton quenching is inhibited effectively when molecular steric hindrance increases. The two chelates have great potential to be used as electrophosphorescent materials.

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Electrochemical formation and phase control of Mg-Li alloys

Mi Lin Zhang, Zeng Chen, Wei Han, Yan Zhuo Lv, Jun Wang

中国化学快报. 2007, 18(09): 1124-1128. https://doi.org/10.1016/j.cclet.2007.07.014

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The electrochemical formation of Mg-Li alloys was investigated in a molten LiCl-KCl (58-42 mol%) eutectic melt at 723 K. The cyclic voltammogram for a Mo electrode showed that the electroreduction of Li⁺ proceeds in a single step and the deposition potential of Li metal was -2.40 V (vs. Ag/AgCl). For Mg electrode, the electroreduction of Li⁺ takes place at less cathodic potential than that at the Mo electrode which was caused by the formation of Mg-Li alloys. Phase of the deposited Mg-Li alloys could be controlled by the electrolysis potential, and the samples were characterized by X-ray diffraction and scanning electron microscopy. The results showed that α-Mg and β-Li phases were obtained at -2.35 and -2.55 V, respectively.

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Effect of spacer length on the liquid crystalline property of azobenzene-containing ABA-type triblock copolymers via ATRP

Xin De Tang, Long Cheng Gao, Xing He Fan, Qi Feng Zhou

中国化学快报. 2007, 18(09): 1129-1132. https://doi.org/10.1016/j.cclet.2007.06.016

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The effect of flexible spacer length on the liquid crystalline property of ABA-type triblock copolymers containing azobenzene groups was investigated. For the study, the monomers, n-[4-(4-ethoxyphenylazo) phenoxy]alkyl methacrylates with varying methylene groups (n=0, 2, 6) were used to synthesize a series of azobenzene-containing amphiphilic triblock copolymers PAnC-PEG-PAnC by atom transfer radical polymerization (ATRP). Differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and one-dimensional X-ray diffraction (1D WAXD) have shown that the glass transition temperatures of these copolymers decreased with increasing n, PA0C-PEG-PA0C has no mesophase, while both PA2C-PEG-PA2C and PA6C-PEGPA6C have a nematic mesophase. These differences derive from the length of spacer groups between the polymer backbone and side-chain LC monomers.

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Lanthanum heterocyclic Schiff-base complex initiated ring-opening polymerization of ε-caprolactone

Wen Lin, Wei Lin Sun, Zhi Quan Shen

中国化学快报. 2007, 18(09): 1133-1136. https://doi.org/10.1016/j.cclet.2007.06.021

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Lanthanum complex supported by the heterocyclic Schiff-base ligand of N-(2-pyridyl)-3, 5-di-tert-butyl-salicylaldimine was prepared and employed for the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL). The polymers obtained with this initiator showed a unimodal molecular weight distribution implied that only one active species was present. Mechanism study revealed that the polymerization proceeds via acyl-oxygen bond cleavage.

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Synthesis and characterization of trimethoxysilyl-functionalized poly (phthalazinone ether ketone)

Qi Feng Jin, Gong Xiong Liao, Xi Gao Jian

中国化学快报. 2007, 18(09): 1137-1140. https://doi.org/10.1016/j.cclet.2007.06.029

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A novel alkoxysilyl-functionalized poly (phthalazinone ether ketone) (PPEK) was prepared for the boundary lubricant application in micro-electro-mechanical system (MEMS). The synthesis of functionalized PPEK was started from the hydroxylation of PPEK, then following with the corresponding ring-opening reaction of 3-glycidoxypropyltrimethoxysilane (GPTMS). The structures of the functional PPEK were confirmed by FTIR, ¹H NMR, ²⁹Si NMR, and UV-vis spectrum.

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Homopolymerization of N-pyrimidinyl acrylamide

De Cheng Wan, Hong Ting Pu, Gen Jin Yang

中国化学快报. 2007, 18(09): 1141-1144. https://doi.org/10.1016/j.cclet.2007.07.037

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Homopolymerization of N-pyrimidinyl acrylamide (NPA) was reported for the first time. The polymer (polyNPA) was soluble only in acidic media and fluoroalcohols, and only in fluoroalcohol was homogeneous polymerization of NPA feasible. ¹H NMR analysis proved that a 1:1 H-bonding complex could be formed between NPA and α, α-bis (trifluoromethyl) phenyl propan-2-ol (BTMP). Cumyl dithiobenzoate mediated reversible addition-fragmentation chain transfer (RAFT) polymerization of NPA in BTMP was carried out. ¹H NMR analyses proved that the molecular weight increased linearly with the monomer conversion. The polymer prepared in conventional solvents was atactic while in protic media the syndiotacticity was slightly enhanced.

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Synthesis of new N-alkylsulfonamide-containing phenylazopyrazolone dyes and their application to unmodified polypropylene fiber

Zhi Hua Cui, Shu Fen Zhang, Jin Zong Yang

中国化学快报. 2007, 18(09): 1145-1147. https://doi.org/10.1016/j.cclet.2007.06.027

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Three new N-alkylsulfonamide-containing phenylazopyrazolone dyes have been synthesized by reaction of sulfonyl chloride intermediates with different saturated aliphatic amines and their molecular structures were confirmed by FTIR, ¹H NMR and MS. The dyes were applied to unmodified polypropylene fabric. These dyes showed high exhaustion as well as higher levels of fastness to washing, sublimation and rubbing compared with C. I. Disperse Yellow 16. The results showed the N-alkylsulfonamide-containing dyes were suitable for dyeing unmodified PP fiber and exhibited good color depth and fastness properties.

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Synthesis and characterization of novel sulfonated polyimide containing phthalazinone moieties as PEM for PEMFC

Hai Yan Pan, Yong Fang Liang, Xiu Ling Zhu, Xi Gao Jian

中国化学快报. 2007, 18(09): 1148-1150. https://doi.org/10.1016/j.cclet.2007.06.032

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A novel sulfonated diamine monomer, 1, 2-dihydro-2-(3-sulfonic-4-aminophenyl)-4-[4-(4-aminophenoxy)-phenyl]phthalazinl-one (S-DHPZDA), was successfully synthesized by direct sulfonation of diamine 1, 2-dihydro-2-(4-aminophenyl)-4-[4-(4-aminophenoxy)-phenyl]-phthalazin-1-one (DHPZDA). A series of sulfonated polyimides (SPIs), which can be used as the material of the proton exchange membrane (PEM) for the proton exchange membrane fuel cell (PEMFC), were prepared from 1, 4, 5, 8-naphthalenetetracarboxylic dianhydride (NTDA), S-DHPZDA, and nonsulfonated diamines DHPZDA. The structure of the monomer and polymers were characterized by FT-IR and ¹H NMR. The solubility of the S-DHPZDA-based SPIs has been improved due to the induction of the phthalazione moiety. The SPIs membranes have high thermo-stability, predominant swelling resistance with high ion exchange capacity.

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Dyes with high affinity for polylactide

Liang He, Shu Fen Zhang, Bing Tao Tang, Li Li Wang, Jin Zong Yang

中国化学快报. 2007, 18(09): 1151-1153. https://doi.org/10.1016/j.cclet.2007.07.031

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Attempts were made to develop dyes with high affinity for polylactide as an alternative to the existent commercial disperse dyes. The dyes synthesized according to the affinity concept of dye to polylactide exhibited excellent dyeing properties on polylactide compared with the commercial disperse dyes.

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Joule-Thomson inversion curve prediction by using equation of state

Behzad Haghighi, Mohammad Reza Hussaindokht, Mohammad Reza Bozorgmehr, Naser Seyed Matin

中国化学快报. 2007, 18(09): 1154-1158. https://doi.org/10.1016/j.cclet.2007.07.002

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In this paper five equations of state are tested for checking their ability to predict the Joule-Thomson inversion curve. These five equations of state are:Mohsennia-Modarres-Mansoori (MMM), Ji-Lemp (JL), modified Soave-Redlich-Kwang (SRK) equation of state by Graboski (MSRK1), modified SRK equation of state by Peneloux and Rauzy (MSRK2), and modified Peng-Robinson (PR) equation of state by Rauzy (PRmr). The investigated equations of state give good prediction of the low-temperature branch of the inversion curve, except for MMM equation of state. The high-temperature branch and the peak of the inversion curve have been observed, in general, to be sensitive to the applied equation of state. The values of the maximum inversion temperature and maximum inversion pressure are calculated for each component used in this work.

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The theoretical study of one-carbon unit transfer with H₂O participation from imidazolidine to dUMP analogue

Chuan Song Qi, Wei Li, Xin Min Wu, Lei Xu, Da Cheng Feng

中国化学快报. 2007, 18(09): 1159-1162. https://doi.org/10.1016/j.cclet.2007.07.001

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The ONIOM quantum mechanics method is used to study the reaction of one-carbon unit transfer from an imidazolidine to 6-aminouracil model with the participation of water molecules. The computation results show that in this reactionthe participation of H₂O molecule makes the energy barrier lower because of the H-bond interaction.

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2007年, 第18卷, 第09期　刊出日期：2007-09-20

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2007年, 第18卷, 第09期 刊出日期：2007-09-20

2007年, 第18卷, 第09期　刊出日期：2007-09-20