中国化学快报

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Chemo-and regioselective hydroboration of △^14,15 in certain cephalostatin analogue

Mansour Nawasreh

中国化学快报. 2008, 19(12): 1391-1394. https://doi.org/10.1016/j.cclet.2008.09.055

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The symmetrical diketone Ⅱ, which can be synthesized in gram scale using a well established method, was used as a starting material to prepare the 11a-methoxy ketomethylene Ⅵ. This is in continuation of our study aiming at the synthesis of multi-hydroxylated cephalostatin analogues, as for example cephalostatin 1 Ⅰ, a potent anti-tumor natural product. Compound Ⅵ underwent chemo- and regioselective hydroboration reaction at only one of △^14,15 double bonds furnishing compound Ⅸ as a major product in a fair yield.

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Design, synthesis and antitumor activity of 3-substituted quinolone derivatives (Ⅰ)

Hua Wang, Qi Dong You, Zhi Yu Li, Yi Quan Zou

中国化学快报. 2008, 19(12): 1395-1397. https://doi.org/10.1016/j.cclet.2008.09.034

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A series of quinolone derivatives containing benzimidazole, benzoxazole or benzothiazole ring were synthesized. The cytotoxicity of 12 new compounds was evaluated in KB, Be17402, A2780 and HT-29 cell lines. Most of synthesized compounds showed moderate inhibitory activity against cancer cells. The inhibitory activities of 6k, against KB and A2780 tumor cells are comparable to that of topotecan, one of topoisomerase I inhibitors.

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Synthesis of new borazines containing crosslinkable groups

Shao Hua Dong, Zhi Min Zheng, Wei Jian Han, Tong Zhao, Cai Hong Xu

中国化学快报. 2008, 19(12): 1398-1400. https://doi.org/10.1016/j.cclet.2008.09.046

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Three new functional group containing borazine derivatives, 2,4,6-tri(allylamino)borazine, 2,4,6-tri(3-ethynylanilino)borazine, and 2,4,6-tri(4-propargyl oxyanilino)borazine were synthesized by aminolysis reaction of 2,4,6-trichloroborazine Cl₃B₃N₃H₃ (TCB). The new compounds were characterized by infrared (IR) spectra, nuclear magnetic resonance (NMR), and mass spectrometry (MS).

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A new synthesis of alkynyl tellurides promoted by CsOH and 4ÅMS

Yin Hui Li, Jian Ping Li, Xiang Xia, Kang Bing Zou, Ruo Xin Li, Xin Hua Xu

中国化学快报. 2008, 19(12): 1401-1402. https://doi.org/10.1016/j.cclet.2008.09.053

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The mixture of cesium hydroxide and terminal alkynes in dry DMF in the presence of 4(Å), molecular sieves was stirred for 3.0 h at room temperature under N₂, then aryltellurenyl bromide in THF was added, and the reaction mixture was stirred for 2.0 h. Alkynyl tellurides were obtained in about 90% yields by flash chromatography.

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Clean heterocyclic synthesis in water: I₂/KI catalyzed one-pot synthesis of quinazolin-4(3H)-ones

Mehdi Bakavoli, Ali Shiri, Zahra Ebrahimpour, Mohammad Rahimizadeh

中国化学快报. 2008, 19(12): 1403-1406. https://doi.org/10.1016/j.cclet.2008.07.016

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Oxidative cyclocondensation of o-aminobenzamide with various aldehydes in water using I₂/KI as catalyst and oxidizing agent is carded out giving the corresponding quinazolin-4(3H)-ones 3a-n in good to excellent yields.

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Synthesis of some new N,N'-diaryisubstituted methylene-bis-dihydro-2H-1,3-benzoxazines

Cherkupally Sanjeeva Reddy, Mekala Raghu

中国化学快报. 2008, 19(12): 1407-1410. https://doi.org/10.1016/j.cclet.2008.07.001

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The synthesis of a new series of six-membered N,N'-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines (5a-e) was achieved in excellent yields by Mannich-type condensation of N,N'-diarylsubstituted methylene-bis-o-hydroxybenzyl amines (4a-e) with formaldehyde in chloroform at reflux. These amines (4a-e) were obtained by the reduction of N,N'-diarylsubstituted methylene-bis-o-hydroxybenzyl imines (3a-e) with NaBH₄, which inturn were obtained by the condensation of methylene-bis-salicylaldehyde (2) with various substituted arylamines.

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A novel application of horseradish peroxidase: Oxidation of alcohol ethoxylate to alkylether carboxylic acid

Li Fei Zhi, Qiu Xiao Li, Yun Ling Li

中国化学快报. 2008, 19(12): 1411-1414. https://doi.org/10.1016/j.cclet.2008.09.030

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A novel application of horseradish peroxidase (HRP) in the oxidation of alcohol ethoxylate to alkylether carboxylie acid in the present of H₂O₂ was reported in this paper. We propose the mechanism for the catalytic oxidation reaction is that the hydrogen transfers from the substrate to the ferryl oxygen to form the α-hydroxy carbon radical intermediate. The reaction offers a new approach for further research structure and catalytic mechanism of HRP and production of alkylether carboxylic acid.

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Expeditious method for the synthesis of novel 2,3,5,6-tetrahydrobenzo[g][1,3,5]oxadiazocine-4-thiones linked with isoxazole

E. Rajanarendar, A. Siva Rami Reddy, M. Srinivas

中国化学快报. 2008, 19(12): 1415-1418. https://doi.org/10.1016/j.cclet.2008.09.025

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Synthesis of novel 3-ary1-5-(3,5-dimethylisoxazol-4-y1)-2,3,5,6-tetrahydrobenzo[g][1,3,5]oxadiazocine-4-thiones 5 has been accomplished from 3,5-dimethylisoxazol-4-amine 1 by condensation with salicylaldehydes, followed by reduction, treatment with aryl isothiocyanates and subsequent smooth ring closure via acetal formation in the presence of formaldehyde.

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Synthesis and anti-inflammatory-analgesic activity of 2',4'-difluoro-3-(carbamoyl)biphenyl-4-yl benzoates

Guang Xiang Zhong, Lu Lu Chen, Jian Li, Wei Xiao Hu, Min You Qi

中国化学快报. 2008, 19(12): 1419-1422. https://doi.org/10.1016/j.cclet.2008.09.018

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Eighteen 2',4'-difluoro-3-(carbamoyl)biphenyl-4-yl benzoates were synthesized from diflunisal in three steps with total yields from 72% to 86%. All compounds were identified by IR,¹H NMR, MS and elemental analysis. The anti-inflammatory activity and analgesic activity for 18 compounds were evaluated. The preliminary assay results showed that compounds 4a and 4p exhibited potent anti-inflammatory-analgesic activity.

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Fe(HSO₄)₃: An efficient, heterogeneous and reusable catalyst for the synthesis of 14-aryl- or alkyi-14H-dibenzo[a,j]xanthenes

Hossein Eshghi, Mehdi Bakavoli, Hassanali Moradi

中国化学快报. 2008, 19(12): 1423-1426. https://doi.org/10.1016/j.cclet.2008.09.048

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Fe(HSO₄)₃ has been used as an efficient and reeyclable catalyst for the one-pot synthesis of 14-aryl- or alkyl-14H-dibenzo[a,j]xanthene derivatives by the reaction of 2-naphtol and aldehydes. Different types of aromatic and aliphatic aldehydes are used in the reaction and in all cases the products were obtained in good to excellent yields.

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Synthesis and evaluation of in vitro antibacterial activity of novel 2,5-disubstituted-1,3,4-thiadiazoles from fatty acids

Mudasir R. Banday, Abdul Rauf

中国化学快报. 2008, 19(12): 1427-1430. https://doi.org/10.1016/j.cclet.2008.09.029

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A series of new 1-(alkenoyl/hydroxyalkenoyl)-4-benzoyl-thiosemicarbazides 2a-d and 2-benzamide-5-alkenyl/hydroxyalk-enyl-1,3,4-thiadiazoles 3a-d were synthesized from fatty acid hydrazides. Structure of all these compounds was confirmed by IR, ¹H NMR, ¹³C NMR, mass spectra and elemental analysis. The bioassay results indicate that some compounds 2c, 2d, 3c and 3d have good antibacterial activity.

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Chemoselective synthesis of δ-lactones via benzyl radical cyclization utilizing K₂S₂O₈-CuCl₂

N. O. Mahmoodi, K. Tabatabaeian, M. Kosari, S. Zarrabi

中国化学快报. 2008, 19(12): 1431-1434. https://doi.org/10.1016/j.cclet.2008.09.027

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Direct chemoselective oxidation of 8-lactones via highly stable benzyl radical cyclization is reported. The one-pot conversion of premade substituted 5-aryl pentanoic acid and 8-benzyl-1-naphthoic acid in the presence of K₂S₂O₈-CuCl₂ results to the δ-lactones in moderate to good yields. The advantages of this methodology is using water as a solvent and utilizing available starting materials.

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MCM-41 anchored sulfonic acid (MCM-41-R-SO₃H): A mild, reusable and highly efficient heterogeneous catalyst for the Biginelli reaction

Gholam Hossein Mahdavinia, Hamid Sepehrian

中国化学快报. 2008, 19(12): 1435-1439. https://doi.org/10.1016/j.cclet.2008.09.028

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An efficient three-component synthesis of 3A-dihydropyrimidinones using MCM-41 anchored sulfonic acid (MCM-41-R-SO₃H) as a mild, heterogeneous catalyst for Biginelli reaction in CH₃CN under reflux condition is described.

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A convenient microwave-assisted synthesis of cinchona alkaloid-derived ligands

Hai Bo Wang, Ping An Wang, Quan Jun Wang, Xiao Li Sun, Lin Lin Jing

中国化学快报. 2008, 19(12): 1440-1444. https://doi.org/10.1016/j.cclet.2008.09.049

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An efficient synthesis of cinchona alkaloid-derived ligands based on solvent-free microwave-assisted reaction was described. The coupling of 1,4-dichlorophthalazine or 3,6-dichloropyridazine with quinine, cinchonine or cinchonidine provide bis- or mono-cinchona alkaloid-derived ligands in moderate to good yields (52-89%) within 15 rain under optimum microwave conditions.

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A new cytotoxic bufadienolide from Chinese medicine Chansu

Xiu Lan Xin, Rong Lan, Jian Huang, Xiao Jie Wang, Jing Ming Jia

中国化学快报. 2008, 19(12): 1445-1446. https://doi.org/10.1016/j.cclet.2008.09.037

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A new cytotoxic bufadienolide was isolated from the traditional Chinese medicine-Chansu. The structure of new compound was elucidated on the basis of spectral methods including 2D NMR. And it showed strong in vitro eytotoxic activity against Hela cells with IC₅₀ of 8.06×10^-2 μmol/L.

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Two new lanostane triterpenoids from Abies sachalinensis

Hui Yuan Gao, Jian Huang, Bo Hang Sun, Masonori Kuroyanagi, Li Jun Wu

中国化学快报. 2008, 19(12): 1447-1449. https://doi.org/10.1016/j.cclet.2008.09.035

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The continuous chemical investigation on the ethyl acetate (EtOAc) soluble fraction of the MeOH extract afforded two new lanostane triterpenoid derivatives including one with a rearranged lanostane skeleton. They were identified as 3,4-seco-8-(14→13R)abeo-17,13-friedo-9β-lanosta-4(28), 7,14(30),24-tetraen-26,23-olide-23-hydroxy-3-oic acid (1) and 7,14-mariesadien-3α-hydroxy-25-methoxy-26-oic acid (2). Structural determination of these compounds were carried out by the spectral studies especially by the two digital (2D)-NMR and high-resolution MS experiences.

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The chemical constituents from Schisandra propinqua var intermedia

Hong Mei Li, Wei Guang Wang, Xiao Nian Li, Yong Zhao, Rong Tao Li, Han Dong Sun

中国化学快报. 2008, 19(12): 1450-1452. https://doi.org/10.1016/j.cclet.2008.09.054

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A new cirmamic acid monoterpenoid ester, intermedin C (1), was isolated from the aerial parts of Schisandra propinqua var. intermedia. The structure of 1 was elucidated by spectroscopic methods including extensive ¹D and ²D NMR techniques.

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A new lavandulyl flavonoid from Sorphora flavescens Ait

Dan Liu, Rong Lan, Xiu Lan Xin, Xiao Jie Wang, Dong Hai Su, Guo Wei Yang

中国化学快报. 2008, 19(12): 1453-1455. https://doi.org/10.1016/j.cclet.2008.09.044

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A new lavandulyl flavonoid was isolated from the rhizome of Sorphora flavescens. The structure of new compound was elucidated on the basis of spectral methods including 2D NMR. And it showed potent cytotoxic activity against Hela cells with IC₅₀ of 1.1μmol/L.

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A new flavone glycoside from Selaginella moellendorffii Hieron.

Tian Mi Zhu, Ke Li Chen, Wen Bing Zhou

中国化学快报. 2008, 19(12): 1456-1458. https://doi.org/10.1016/j.cclet.2008.09.042

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From the ethanol extract of Selaginella moellendorffii Hieron., a new flavone O-glycoside and three known flavone C-glycosides have been isolated and identified as 5-carboxymethyl-4'-hydroxyflavone-7-O-β-D-glucopyranoside 1, 6,8-di-C-β-D-glucopyrano-sylapigenin 2, 6-C-β-D-glucopyranosyl-8-C-β-D-xylopyranosyl apigenin 3, 6-C-β-D-xylopyranosyl-8-C-β-D-glucopyranosylapi-genin 4, respectively. Their structures were elucidated by spectroscopic methods.

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New lignan glycosides from Glehnia littoralis

Wei Xue Kong, Zhong Yuan

中国化学快报. 2008, 19(12): 1459-1461. https://doi.org/10.1016/j.cclet.2008.09.041

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From the roots ethanol extract of Glehnia littoralis, two new lignan glycosides, named glehlinoside E (1) and F (2), were obtained. Their structures were determined to be (-)-secoisolariciresinol 4-O-β-D-(6-O-feruloyl) glucopyranoside (1) and (-)-secoisolariciresinol 4-O-β-D-(6-O-caffeloyl) glucopyranoside (2) by analysis of their spectral data, respectively.

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Leucospilotaside C, a new sulfated triterpene glycoside from sea cucumber Holothuria leucospilota

Hua Han, Yang Hua Yi, Bao Shu Liu, Xiao Hua Wang, Min Xiang Pan

中国化学快报. 2008, 19(12): 1462-1464. https://doi.org/10.1016/j.cclet.2008.09.051

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A new triterpene glycoside, leueospilotaside C, along with two known saponin, was isolated from sea cucumber Holothuria leucospilota collected from the South China Sea, and its structure was elucidated as 3-O-{4'-O-sodiumsulfate-β-D-xylopyranosyl}-holosta-22,25-epoxy-9-ene-3β, 12α, 17α-triol (1) by extensive spectroscopic analysis and chemical methods. The glycosides have the same triterpene aglycone, but differ in the oligosaccharide moieties.

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Spectral studies of the interaction between sanguinarine and guanosine

Zuo Peng Du, Quan Ling Suo, Xiao Yan Zhang, Ling Wei Zhang, Xiong Hui Wei

中国化学快报. 2008, 19(12): 1465-1469. https://doi.org/10.1016/j.cclet.2008.09.039

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The interaction between sanguinarine and guanosine was investigated by using UV-vis and fluorescence spectra at pH 7.2. The binding of sanguinarine to guanosine was substantiated by the hypochromism and bathochromism in the absorption spectra and the emission quenching in fluorescence spectra. The fluorescence lifetime results, the varieties of the fluorophore absorption spectra and the decrease of the binding constant with the increasing temperature all indicate that the fluorescence quenching is static. The ratio and constant of the binding cytidine to sanguinarine are 2 and 6.44×10⁷, respectively. The result shows that the binding of sanguinarine to guanosine is not only exothermic but also entropy-driven with △H=-8.53 kJ/mol, △S=0.12 kJ/(mol K), and △G=-44.57 kJ/mol at 298.15 K.

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A novel method for the spectrophotometric determination of cefradine by using sodium nitroprusside as chromogenic reagent

Hua Zhang, Ling Li Wu, Quan Min Li, Xin Zhen Du

中国化学快报. 2008, 19(12): 1470-1474. https://doi.org/10.1016/j.cclet.2008.09.014

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A novel method is developed for the determination of cefradine by using sodium nitroprusside as chromogenic reagent. The experiment indicates that a russety product is formed by the reaction of cefradine with sodium nin'oprusside in basic solution, and the maximum absorption wavelength (λ_max) of russety product is 505 nm. And the sensitization of tetradecyl benzyl dimethyl ammonium chloride for the reaction of cefradine with sodium nitroprusside is remarkable. The apparent molar absorption coefficient (ε₅₀₅)is 2.81×10³ L/mol cm. The linear equation is A=0.0657+0.00804C (μg/mL) in the range of 1.50-55.0μg/mL of cefradine with a correlation coefficient r=0.9992, and the detection limit is 1.38μg/mL. This method has been applied to determine cefradine in capsule and tablet samples.

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Design, synthesis and characterization of a novel pH-sensitive hydrogel

Jiao Xia Sun, Yan Feng Luo, Hui Peng, Zhi Wei Han

中国化学快报. 2008, 19(12): 1475-1478. https://doi.org/10.1016/j.cclet.2008.09.033

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A novel degradable pH-sensitive hydrogel with pendent carboxyl groups was designed and synthesized from ethylenediami-netetraacetic dianhydride (EDTAh) and butanediamine (BDA) with dicyclohexylcarbodiimide (DCC) as a condensating agent and BDA as a crosslinking agent. The obtained polymers were characterized by¹³C NMR, ¹H NMR and FTIR. The swelling experiments of the hydrogel in pH 3, 7, and 12 media indicated much higher swelling ratio in pH 12 media than in pH 3 and pH 7 media, exhibiting sound pH sensitivity. The pH sensitivity of this type of hydrogel may be regulated through controlling the type and the dose of the crosslinking agent.

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Characteristic fragmentation behavior of the analogs of endomorphin-2 with phenylglycine in position 3 or 4 by ESI-FT tandem mass spectrometry

Chang Feng Hu, Chuan Jun Zhu, Yan Feng Gao, Xuan Shao, Rui Wang, Yu Xin Cui

中国化学快报. 2008, 19(12): 1479-1482. https://doi.org/10.1016/j.cclet.2008.09.023

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A series of analogs of endomorphin-2(EM-2) with phenylglycine (Phg) in position 3 or 4 were synthesized. In electrospray ionization Fourier transform ion cyclotron resonance (ESI-FT-ICR) MS/MS spectra of these compounds, some b, y, a, and internal ions were observed and slight mass differences between the calculated and observed results are obtained. Their sequences were derived successfully. However, the MS/MS patterns of these analogs with ^DPhg and ^Lphg were very similar. It is hard to distinguish them by MS/MS spectra. Moreover, if the third position was substituted by phenylglyeine (L or D), a rearrangement could occur in MS/MS experiment to lose proline residue.

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Ionic liquid modified GC electrode for the direct electrochemistry of chloroperoxidase

Liu Yang, Xia Qin Wu, Rong Wang, Zhong Qing Lu, Wen Jing Hou, He Xing Li

中国化学快报. 2008, 19(12): 1483-1486. https://doi.org/10.1016/j.cclet.2008.09.040

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Chloroperoxidase (CPO) was immobilized by konjac glucornannan (KGM) on the 1-butyl-3-methyl imidazolium tetrafluor-oborate [BMIM][BF₄]/Nafion modified glassy carbon electrode. The electrochemical behaviors of the immobilized CPO were investigated by cyclic voltammetry. The results showed that CPO was successfully immobilized on the GCE and underwent fast direct electron transfer reactions with the formal potential at -0.3 V vs. SCE. The modified electrode showed a good catalytic activity for electrocatalytical reduction of O₂ and H₂O₂.

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Determination of triazine herbicide residues in water samples by on-line sweeping concentration in micellar electrokinetic chromatography

Shuai Hua Zhang, Yuan Yuan Yang, Dan Dan Han, Chun Wang, Xin Zhou, Xiao Huan Zang, Zhi Wang

中国化学快报. 2008, 19(12): 1487-1490. https://doi.org/10.1016/j.cclet.2008.09.017

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A new method for the determination of atrazine, simazine and prometryn in water samples by on-line sweeping concentration technique in micellar electrokinetic chromatography (MEKC) was developed. Various parameters affecting sample enrichment and separation efficiency were systematically studied. Compared with the conventional MEKC method, up to 60-200-fold improve-merit in concentration sensitivity was achieved in terms of peak height by using this sweeping injection technique. The compound strychnine was used as the internal standard for the improvement of the experimental reproducibility. The limits of detection (S/ N=3:1) for atrazine, simazine and prometryn were 9, 10 and 0.5 ng mL^-1, respectively. This method has been successfully applied to the analysis of atrazine, simazine and prometryn in lake, steam and ground water.

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Osteryoung square wave voltammetric determination of lactose in food samples by a derivative procedure

Yong Nian Ni, Yue Rong Wang, Serge Kokot

中国化学快报. 2008, 19(12): 1491-1494. https://doi.org/10.1016/j.cclet.2008.09.052

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A method for determination of lactose in food samples by Osteryoung square wave voltammetry (OSWV) was developed. It was based on the nucleophilic addition reaction between lactose and aqua ammonia. The carbonyl group of lactose can be changed into imido group, and this increases the electrochemical activity in reduction and the sensitivity. The optimal condition for the nucleophilic addition reaction was investigated and it was found that in NH₄Cl-NH₃ buffer of pH 10.1, the linear range between the peak current and the concentration of lactose was 0.6-8.4 mg L^-1, and the detection limits was 0.44 mg L^-1. The proposed method was applied to the "determination of lactose in food samples and satisfactory results were obtained.

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Preparation of thiophilic paramagnetic adsorbent for separation of antibodies

Ming Qin Chen, Zhi Yong Lin, Hao Qian

中国化学快报. 2008, 19(12): 1495-1498. https://doi.org/10.1016/j.cclet.2008.09.050

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The micron-sized mierospheres with superparamagnetic property were synthesized with vinyl acetate and divinylbenzene by microsuspension polymerization. After the complete alcoholysis, these hydroxyl-functionalized microspheres were activated by divinylfone and modified with mercaptoethanol to prepare the thiophilic magnetic adsorbent, which was used to specifically isolate immunoglobulin G (IgG) from human serum. This thiophilic magnetic adsorbent performed an evident salt-dependent adsorption behavior for IgG. Due to their salt-promoted adsorption towards IgG under high salt concentration, the absorbed antibodies could be extracted in low salt concentration with high purity.

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Novel Zn(Ⅱ) ladder-like coordination polymer constructed from designed ferrocenyl ligand

Hai Fang Zhang, Zi Feng Li, Gang Li, Li Peng Wang, Jia Bin Li, Guang Jian Mei

中国化学快报. 2008, 19(12): 1499-1503. https://doi.org/10.1016/j.cclet.2008.09.056

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Reaction of Zn(NO₃)₂·6H₂O with 3-(4-carboxylphenylamino)-1-ferrocenyl-2-butylen-1-one (HL) and 4,4'-bipyridine (4,4'-bipy) in methanol solution resulted in a novel ladder-like coordination polymer {[Zn₂L₂(μ₂-L)₂(4,4'-bipy)₂]·MeOH}_n (1). Its crystal structure, thermal and electrochemical properties axe presented.

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High temperature oxidation of chromium with nanometric ceria sol-gel coating

Hui Ming Jin, Lin Nan Zhang

中国化学快报. 2008, 19(12): 1504-1508. https://doi.org/10.1016/j.cclet.2008.09.038

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Isothermal oxidation behavior of chromium with and without nanometric sol-gel CeO₂ coating is studied at 1000℃ in air. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to examine the surface morphology and microstructure of their oxide films. It is found that ceria coating greatly improves the anti-oxidation property of chromium. Laser Raman spectrometer and X-ray diffraction spectrometer (XRD) are also used to study the stress level in oxide films formed on ceria-coated and ceria-free Cr. The difference in oxidation behavior is mainly attributed to the fact that ceria greatly reduces the growth speed and grain size of Cr₂O₃ film, and this fine grain-sized Cr₂O₃ film probably has better high temperature plasticity, i.e. oxide film can relieve parts of compressive stress by means of creeping. XRD and Raman testing results both show the stress declination due to nano-CeO₂ application, and their deviation is analyzed concerning to the rare earth effect.

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Solid-state electrochemiluminescence of a novel iridium(Ⅲ) complex

Shu Quan Sun, Qi Jun Song, He Fang Yuan, Yu Qiang Ding

中国化学快报. 2008, 19(12): 1509-1512. https://doi.org/10.1016/j.cclet.2008.09.031

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The sofid-state ECL behavior of a water-insoluble bis-cyclometalated (pq)₂Ir(N-phMA) complex is presented, in which pq is a 2-phenylquinoline anion and N-phMA is N-phenyl methacrylamide, a monoanionic bidentate ligand. The MWNTs/(pq)₂Ir(N-phMA) film, MWNTs/Ru(bpy)₃²⁺ film and (pq)₂Ir(N-phMA) directly modified glassy carbon electrode were fabricated; only the MWNTs/(pq)₂Ir(N-phMA) film can produce steady ECL in the presence of tri-n-propylamine as a coreactant.

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Three competitive dissociation pathways of glyoxalate

Qi Gang Deng, De Rui Zhou

中国化学快报. 2008, 19(12): 1513-1516. https://doi.org/10.1016/j.cclet.2008.09.045

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Three possible lower barrier dissociation pathways of the deportonated glyoxylic acid in aqueous solution axe predicated by means of B3LYP and CCSD(T) (single-point) methods. The calculated results suggest that the formation of formate ion is the energetically most favorable process, and that the decomposition reaction is occurring through nucleophilic attack of negatively charged carboxylic oxygen on the a-carbon. This is in good agreement with the proposed mechanisms of the mass spectrometry experiment.

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2008年, 第19卷, 第12期　刊出日期：2008-12-20

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2008年, 第19卷, 第12期 刊出日期：2008-12-20

2008年, 第19卷, 第12期　刊出日期：2008-12-20