2008年, 第19卷, 第07期　刊出日期：2008-07-20

  

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  A simple and efficient synthesis of the valsartan

  Chen Xi Zhang, Guo Jun Zheng, Fu Qiang Bi, Yu Lin Li

  中国化学快报. 2008, 19(07): 759-761. https://doi.org/10.1016/j.cclet.2008.04.032

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Valsartan 1,one of the most important agents used in antihypertensive therapy today,was synthesized starting from L-valin methyl ester hydrochloride 2 through four steps in an overall yield of 60%.The key step involves the palladium-catalyzed SuzuKi coupling.This method overcomes many of the drawbacks associated with the previously reported syntheses and is more suitable for industrial production.
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  ZrOC1₂·8H₂O catalyzed one-pot synthesis of 2,4,5-triaryl-1H-imidazoles and substituted 1,4-di(4,5-diphenylimidazolyl)benzene

  Jaiprakash N. Sangshetti, Nagnnath D. Kokare, Sandeep A. Kotharkar, Devanand B. Shinde

  中国化学快报. 2008, 19(07): 762-766. https://doi.org/10.1016/j.cclet.2008.05.007

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  A simple one-pot synthetic method for the preparation of 2,4,5-triaryl-lH-imidazoles from benzoin or benzil,ammonium acetate,aromatic aldehydes,and ZrOCl₂·8H ₂O catalyst is described.The ZrOCl₂-8H₂O catalyst was found to be equally effective for aromatic and heteroaromatic aldehydes and also for the preparation of substituted 1,4-di(4,5-diphenylimidazol-yl) benzene.
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  PMA-SiO₂catalyzed synthesis of β-keto enol ethers

  P. Srihari, S.S. Mandal, J.S.S. Reddy, R. Srinivasa Rao, J.S. Yadav

  中国化学快报. 2008, 19(07): 767-770. https://doi.org/10.1016/j.cclet.2008.05.006

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  An efficient conversion of β-diketones into corresponding β-keto enol ethers with catalytic amount of PMA-SiO₂ has been achieve
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  Synthesis of 1,8-dioxooctahydroxanthenes utilizing PMA-SiO₂as an efficient reusable catalyst

  P. Srihari, S.S. Mandal, J.S.S. Reddy, R. Srinivasa Rao, J.S. Yadav

  中国化学快报. 2008, 19(07): 771-774. https://doi.org/10.1016/j.cclet.2008.05.005

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  PMA-SiO₂ has been utilized as an efficient catalyst system in preparation of 1,8-dioxooctabydroxanthenes.
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  Cerium(Ⅳ) ammonium nitrate catalysed facile and efficient synthesis of polyhydroquinoline derivatives through Hantzsch multicomponent condensation

  Cherkupally Sanjeeva Reddy, Mekala Raghu

  中国化学快报. 2008, 19(07): 775-779. https://doi.org/10.1016/j.cclet.2008.04.040

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  A general and convenient practical approach for the synthesis of polyhydroquinoline derivatives has been achieved via one-pot four-component Hantzsch condensation of aromatic aldehydes,dimedone,ethyl acetoacetate and ammonium acetate in the presence of a catalytic amount of cerium(Ⅳ) ammonium nitrate (CAN),in ethanol solvent at ambient temperature.Simple work-up,mild reaction conditions,inexpensive and non-toxic catalyst,and excellent product yields are the advantageous features of this method.
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  Novel generation of 9H-furo[3,2-b]chromen-9-ones from (E)-3-hydroxy-2-styrylchromones by excited state intramolecular proton transfer

  Surinder Berar, Urmila Berar, Satish C. Gupta, Ramesh C. Kamboj

  中国化学快报. 2008, 19(07): 780-782. https://doi.org/10.1016/j.cclet.2008.04.011

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  Photocyclisation of substituted (E)-3-hydroxy-2-(1′-methyl-2′-phenylvinyl)-4-oxo-4H-1-benzopyrans to yield linear novel tricyclic 9H-furo[3,2-b]chromen-9-ones and angular fused tetracyclic xanthenones is described.
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  A facile synthesis of terminal arylacetylenes via Sonogashira coupling reactions catalyzed by MCM-41-supported mercapto palladium(0) complex

  Ya Ping Xu, Rong Hua Hu, Ming Zhong Cai

  中国化学快报. 2008, 19(07): 783-787. https://doi.org/10.1016/j.cclet.2008.05.016

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  A variety of terminal arylacetylenes have been conveniently synthesized in good to high yields via Sonogashira coupling of aryl iodides with (trimethylsilyl)acetylene catalyzed by MCM-41-supported mercapto palladium(0) complex,followed by desilylation under mild conditions.This polymeric palladium catalyst can be reused many times without any decrease in activity.
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  Solar thermochemical reactions Ⅱ¹:Synthesis of 2-aminothiophenes via Gewald reaction induced by solar thermal energy

  Ramadan Ahmed Mekheimer, Mohamed Abdallah Ameen, Kamal Usef Sadek

  中国化学快报. 2008, 19(07): 788-790. https://doi.org/10.1016/j.cclet.2008.04.041

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  Green conditions have been developed for the synthesis of substituted 2-aminothiopbenes employing multicomponent reactions of a ketone with active methylene nitrile and elemental sulphur induced by free solar thermal energy.
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  Studies on the esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one with acid chlorides under different conditions

  Ru Shu Sun, Yang Wang, Peng Xia

  中国化学快报. 2008, 19(07): 791-794. https://doi.org/10.1016/j.cclet.2008.04.038

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  The esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one (4) with acid chlorides afforded normal oxime-esters 3a-e in 35-78% yields in presence of excessive 4-dimethylaminopyridine as the acid scavenger,whereas the reactions gave unexpected 8-substituted products N-(8-chloro-4-methyl-2-oxo-2H-furo-[2,3-h]chromen-9-y1)amides (5a-c)and 4-methyl-2,9-dioxo-8,9-dihydro-2H-furo[2,3-h]chromen-8-ylcarboxyloates (6d-e) by using excessive acid chlorides.The structures of 10 new compounds were determined by ¹H NMR,¹³C NMR,MS and HRMS,and the possible mechanism for the formation of unexpected products 5a-e and 6d-e was also proposed.
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  Practical and concise synthesis of 2-oxo-3,4,5,6-tetraethoxyazepane from D-glucono-1,5-lactone

  Yan Jiao, Zhi Jie Fang, Yu Hua Jiang, Bao Hui Zheng, Jie Cheng

  中国化学快报. 2008, 19(07): 795-796. https://doi.org/10.1016/j.cclet.2008.04.044

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  2-Oxo-3R,4S,5S,6S-tetraethoxyazepane was conveniently synthesized from D-glucono-1,5-lactone with a yield of 10% overall.The key step of synthetic route-reductive 1,6-cyclization was completed efficiently by using Ph₃P to give the expected lactam.
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  Preparation and chiral recognition of a novel chiral stationary phase for HPLC,based on mono(6^A-N-1-(2-hydroxyl)-phenylethylimino-6^A-deoxy)-β-cyclodextrin and covalently bonded silica gel

  Xiao Ping Chen, Zhi Ming Zhou, Hao Yuan, Zi Hui Meng

  中国化学快报. 2008, 19(07): 797-800. https://doi.org/10.1016/j.cclet.2008.04.045

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  A novel chiral stationary phase (CSP) was prepared by immobilizing mono(6^A-N-1-(2-hydroxyl)-phenylethylimino-6^A-deoxy)-β-cyclodextrin onto the surface of silica gel via a longer spacer.This chiral stationary phase exhibited good enantios electivity for a variety of chiral compounds under reversed-phase conditions.
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  Synthesis and preliminary biological evaluation of the derivatives of O⁶-benzylguanine as inactivators of O⁶-alkylguanine-DNA alkyltransferase

  Lei Zhang, Bing Jia, Chang Feng Hu, Fan Wang, Yu Xin Cui

  中国化学快报. 2008, 19(07): 801-804. https://doi.org/10.1016/j.cclet.2008.04.046

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  A series of new O⁶-BG derivatives (14-21,23-30) were synthesized as inactivators of O⁶-Alkylguanine-DNA alkyltransferase (AGT), and their ability to inhibit AGT was preliminary evaluated by MTT with O⁶-BG as the control. The result suggested compound 30 displayed a higher activity than O⁶-BG.
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  The first total synthesis of ligudentatin A

  Chen Xi Zhang, Fu Qiang Bi, Yu Lin Li

  中国化学快报. 2008, 19(07): 805-806. https://doi.org/10.1016/j.cclet.2008.04.037

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Ligudentatin A 1,a new phenolic norsesquiterpenes,was first synthesized starting from (+)-periUaldehyde 3 through five steps,successively,in an overall yield of 20.8%.The key steps were the Diels-Alder reaction and aromatization of enone to phenol.
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  Synthesis and photoactivity of phenylazonaphthalene peptide nucleic acid monomers

  Jin Du Li, Miao Chen, Sheng Liu, Hao Bo Zhang, Zhi Lu Liu

  中国化学快报. 2008, 19(07): 807-810. https://doi.org/10.1016/j.cclet.2008.05.023

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Phenylazonaphthalene peptide nucleic acid (PNA) monomers were successfully synthesized,and their photoisomerization was examined.The new PNA monomers showed reversible trans-cis isomerization with UV and visible light irradiation,which might be the foundation of photo-regulating the hybridization between PNA containing phenylazonaphthalene unit and DNA.Simultaneously,the fluorescence of the new PNA monomers might make them especially useful as structural probes.
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  Synthesis and antitumor activity of novel 10-amino acids ester homocamptothecin analogues

  Liang You, Wan Nian Zhang, Zhen Yuan Miao, Wei Guo, Xiao Ying Che, Wen Ya Wang, Chun Quan Sheng, Jiang Zhong Yao, Ting Zhou

  中国化学快报. 2008, 19(07): 811-813. https://doi.org/10.1016/j.cclet.2008.05.011

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  Nine racemic homocamptothecin derivatives were synthesized and in vitro antitumor activities were evaluated by standard MTT method.The results showed that some of the compound had higher antitumor activity than iritecan.
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  Convenient synthesis of (2S,3R,4R,5S,6R)-2-(3-(4-ethylbenzyl)-4-chlorophenyl)-6-(hydroxymethyl)-tetrahydro-2H-pyran-3,4,5-triol

  Yong Hai Liu, Da Li Li, Lu De Lu, Zhen Yuan Miao

  中国化学快报. 2008, 19(07): 814-816. https://doi.org/10.1016/j.cclet.2008.05.009

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A convenient approach for the preparation of (2S,3R,4R,5S,6R)-2-(3-(4-ethylbenzyl)-4-chlorophenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol 1 is developed.The target compound via four steps is synthesized from 4-bromo-2-(bromomethyl)-1-chlorobenzene and the isomers of undesired ortho-products were avoided during the preparation.
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  A new glycoside from Polygala tenuifolia Willd

  Tun Hai Xu, Gang Lv, Tong Hua Liu, Ya Juan Xu, Yun Shan Si, Sheng Xu Xie, Hong Feng Zhao, Dong Han, Dong Ming Xu

  中国化学快报. 2008, 19(07): 817-820. https://doi.org/10.1016/j.cclet.2008.04.030

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new triterpenoid glycoside,3-β-O-β-D-glucopyranosyl presenegenin 28-O-α-L-arabipyranosyl(1→3)-β-D-xylopyranosyl(1→4)-[β-D-apiofuranosyl(1→3)]-α-L-rhanmopyranosyl(1→2)-[α-L-rhamnopyranosyl(1→3)]-β-D-fucopyranosyl ester (1) was isolated from the Polygala tenuifolia Willd.,together with two known saponins,including polygalasaponinⅩⅩⅣ (2) and polygalasaponinⅩⅩⅧ(3).The structure of new compound was elucidated by spectroscopic methods.
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  Two new C-glycosylflavones from the leaves of Iris lactea var.chinensis

  Wen Juan Shen, Min Jian Qin, Pan Shu, Chao Feng Zhang

  中国化学快报. 2008, 19(07): 821-824. https://doi.org/10.1016/j.cclet.2008.04.031

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Two new acylated C-glycosylflavones were isolated from the leaves of Iris lactea vat.chinensis,and their structures were elucidated on the basis of extensive NMR experiments and mass spectrometry methods and were assigned as 5-hydroxy-4′-methoxyflavone-7-O-(β-D-2""4""-diacetylrhamnopyranosyl)-6-C-[O-(α-L-6′′′-acetyl-glucopyranosyl)-1→2-β-D-glucopyranoside] (irislactin A) and 5-hydroxy-4′,7-dimethoxyflavone-6-C-[O-(α-L-2′′′,3′′′-diacetylrhamno-pyranosyl)-1→2-β-D-glucopyranoside] (irislactin B).
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  Two new steroidal glucosides from Ophiopogon japonicus (L.f.) Ker-Gawl

  Ya Jiuan Xu, Tun Hai Xu, Ling Zhu Hao, Hong Feng Zhao, Sheng Xu Xie, Yun Shan Si, Dong Han, Dong Ming Xu

  中国化学快报. 2008, 19(07): 825-828. https://doi.org/10.1016/j.cclet.2008.04.033

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Two new steroidal glucosides,26-O-β-D-glucopyranosyl (25S)-furost-5-ene-1β,3β,22α,26-tetraol 1-O-β-D-xylopyranosyl-(1→3)-[α-L-rhamnopyranosyl-(1→2)]-β-D-fucopyranoside and (25R) spirost-5-ene-3β,14α-diol-3-β-O-β-L-rhamnopyranosyl-(1→2)-[β-D-xylopyranosyl(1→4)]-β-D-glucopyranoside,were isolated from the Ophiopogon japonicus (L.f.) Ker-Gaw.Their structures were elucidated by spectroscopic methods.
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  A new caffeic ester from Incarvillea mairei var.granditlora (Wehrhahn) Grierson

  Yong Qing Su, Wei Dong Zhang, Chuan Zhang, Run Hui Liu, Yun Heng Shen

  中国化学快报. 2008, 19(07): 829-831. https://doi.org/10.1016/j.cclet.2008.05.003

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new cafferic ester,(+)-2-(1-hydroxyl-4-oxocyclobexyl) ethyl caffeate,was isolated from the 80% ethanol extract of the whole plants of Incarvillea mairei var.granditlora (Wehrhahn) Grierson.The structure of the compound was established by spectroscopic methods.
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  A new alkaloid from Castanea mollissima Blume

  Dong Song Zhang, Hui Yuan Gao, Xiao Mei Song, Zhi Shu Tang, Li Jun Wu

  中国化学快报. 2008, 19(07): 832-834. https://doi.org/10.1016/j.cclet.2008.05.019

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new alkaloid,named 6-(2′, 3′-dihydroxy-4′hydroxymethyl-tetrahydro-furan-1′-y1)cyclopentadiene[c]pyrrole-1,3-diol,was isolated from the seeds of Castanea mollissima Blume.The structure was elucidated based on spectroscopic evidence including 2D NMR techniques.
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  A new hopane triterpenoid from Saxiglossum angustissimum

  Hui Fang Pi, Zhi Hong Zhong, Han Li Ruan, Peng Zhang, Yong Hui Zhang, Ji Zhou Wu

  中国化学快报. 2008, 19(07): 835-836. https://doi.org/10.1016/j.cclet.2008.04.034

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new hopane triterpenoid,hopane 22,29-diol-29-formate(1),has been isolated from the whole herbs of Saxiglossum angustissimum (Gies.) Ching and its structure has been successfully determined on the basis of spectroscopic evidences.
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  A new compound with cytotoxic activities from the leaves of Panax ginseng C.A. Meyer

  Li Bo Wang, Zhao Hua Wu, Hui Yuan Gao, Jian Huang, Bo Hang Sun, Li Jun Wu

  中国化学快报. 2008, 19(07): 837-840. https://doi.org/10.1016/j.cclet.2008.05.017

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new compound,3,6,20(S)-trihydroxy-12,23-epoxydammar-24-ene,6,20-di-O-β-D-glucopyranoside (1),was isolated from the leaves of Panax ginseng C.A.Meyer,whose structural elucidation was carried out by means of spectral analysis (including IR,HRFAB-MS and NMR).This compound showed the moderate eytotoxie activities against U937 and HeLa ceils by using the MTT method.
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  A new neuroprotective bakkenolide from the rhizome of Petasites tricholobus

  Na Zhang, Mei Li Guo, Ge Zhang, Run Ping Li

  中国化学快报. 2008, 19(07): 841-844. https://doi.org/10.1016/j.cclet.2008.04.036

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A new bakkenolide-type compound, bakkenolide-Va(1), was isolated from the rhizome of Petasites tricholobus. The structure was characterized on the basis of various NMR (¹H, ¹³C, ¹H-¹H COSY, HMQC, HMBC and NOESY) and mass spectrometry data. The neuroprotective activity of bakkenolide-Va was investigated in primarily cultured neurons treated by hypoxia-glucose deprivation and various types of oxidative insults.
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  A new glycoside from the leaves of Neoalsomitra integrifoliola

  Dong Min Su, Jing Qu, You Cai Hu, Shi Shan Yu, Wen Zhao Tang, Yun Bao Liu, Shuang Gang Ma, De Quan Yu

  中国化学快报. 2008, 19(07): 845-848. https://doi.org/10.1016/j.cclet.2008.04.043

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  A new ionone glycoside (6R,9R)-blumenyl α-L-rhanmopyranosyl-(1→6)-β-D-gluco-pyranoside (1),together with a new natural product 2-methoxyl-4-trans-propenyl-phenol α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (2),was isolated from the leaves of Neoalsomitra integrifoliola.Their structures were elucidated by chemical and spectral analysis.Compound 1 showed weak anti-inflammatory and low-level antioxidant activities.
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  A new ent-abietane diterpenoid from Isodon macrophyllus

  Zheng Yue Chen, Pei Yong Qiu, Yong Xue Wang, Su Ping Bai, Fu Lin Yan, Ji Xia Zhang, Han Dong Sun

  中国化学快报. 2008, 19(07): 849-851. https://doi.org/10.1016/j.cclet.2008.05.018

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  A new ent-abietane diterpenoid,named dayecrystal C,was isolated from the EtOAc extract of the dried leaves of Isodon macrophyllus.Its structure was determined on the basis of spectroscopic methods.
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  Two new diterpenoids from Rabdosia japonica var.glaucocalyx

  Zhao Bao Xiang, Yi Xin Xu, Yang Shen, Li Jin, Hou Peng Wang, Hai Sheng Chen

  中国化学快报. 2008, 19(07): 852-854. https://doi.org/10.1016/j.cclet.2008.05.012

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Two new diterpenoids,named glaucocalyxin F and glaucocalyxin X,respectively,were isolated from the whole plant of Rabdosia japonica (Burro.f.) Hara vat.glaucocalyx (Maxim.) Hara.Their structures was established on the basis of spectral analysis.
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  CdTe quantum dots as fluorescence sensor for the determination of vitamin B6 in aqueous solution

  Jie Fang Sun, Cui Ling Ren, Li Hong Liu, Xing Guo Chen

  中国化学快报. 2008, 19(07): 855-859. https://doi.org/10.1016/j.cclet.2008.04.029

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  A novel,rapid and simple CdTe quantum dots (QDs) based technology platform was established for selective and sensitive determination of vitamin B6 in aqueous solution.It can perform accurate and reproducible quantification of vitamin B6 in pharmaceutical with satisfactory results.
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  Simultaneous spectrophotometric determination of cobalt,copper and nickel using 1-(2-thiazolylazo)-2-naphthol by chemometrics methods

  Ali Niazi, Ateesa Yazdanipour

  中国化学快报. 2008, 19(07): 860-864. https://doi.org/10.1016/j.cclet.2008.04.047

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  The simultaneous determination of cobalt,copper and nickel using 1-(2-thiazolylazo)-2-naphthol (first figure of this article) by spectrophotometric method is a difficult problem in analytical chemistry,due to spectral interferences.By multivariate calibration methods,such as partial least squares (PLS) regression,it is possible to obtain a model adjusted to the concentration values of the mixtures used in the calibration range.Orthogonal signal correction (OSC) is a preprocessing technique used for removing the information unrelated to the target variables based on constrained principal component analysis.OSC is a suitable preprocessing method for PLS calibration of mixtures without loss of prediction capacity using spectrophotometric method.In this study,the calibration model is based on absorption spectra in the 550-750-nm range for 21 different mixtures of cobalt,copper and nickel.Calibration matrices were formed from samples containing 0.05-1.05,0.05-1.30 and 0.05-0.80 μg mL^-1 for cobalt,copper and nickel,respectively.The root mean square error of prediction (RMSEP) for cobalt,copper and nickel with OSC and without OSC were 0.007,0.008,0.011 and 0.031,0.037,0.032 μg mL^-1,respectively.This procedure allows the simultaneous determination of cobalt,copper and nickel in synthetic and real samples and good reliability of the determination was proved.
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  TiO₂ nanotubes :A novel solid phase extraction adsorbent for the sensitive determination of nickel in environmental water samples

  Xin Ning Zhao, Qi Zeng Shi, Guo Hong Xie, Qing Xiang Zhou

  中国化学快报. 2008, 19(07): 865-867. https://doi.org/10.1016/j.cclet.2008.05.004

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  A novel method was developed for the sensitive determination of nickel in environmental water samples by using TiO₂ nanotubes,a new nanomaterial,as solid phase extraction absorbent.In general,TiO₂ nanomaterials were often used for catalytic degradation of pollutants in environmental field,and only a very few application in environmental analytic chemistry.In present work,TiO₂ nanotubes was firstly used for the enrichment of nickel and the factors would influence the preconcentration performance were optimized.Under the optimal conditions,TiO₂ nanotubes exhibited its good enrichment capacity for nickel and the detection limit of the proposed method was 1 ng mL^-1.The proposed method was validated with real water samples,and excellent results were obtained with the spiked recoveries in the range of 94.4-99.2%,respectively.
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  Novel hot-melting hyperbranched poly(ester-amine) bearing self-complementary quadruple hydrogen bonding units

  Yi Peng Qiu, Li Ming Tang, Yu Wang, Shi You Guan

  中国化学快报. 2008, 19(07): 868-870. https://doi.org/10.1016/j.cclet.2008.05.001

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  Hyperbranched poly(amine-ester)s bearing serf-complementary quadruple hydrogen bonding units display excellent mechanical and temperature-dependent melt rheological properties,which make them suitable as novel hot-melting materials.
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  Novel hot-melting hyperbranched poly(ester-amine) bearing self-complementary quadruple hydrogen bonding units

  Li Zhou, Jiao Ning Tang, Bo Liu, Yi Guang Wu, Ai Lian Wang, Chuan Dong Liao

  中国化学快报. 2008, 19(07): 871-876. https://doi.org/10.1016/j.cclet.2008.05.015

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  The liquid membrane oscillation of a novel water (aqueous tetradecyl trimethyl ammoniumbromide,TTAB and alcohol sohition)/oil (picdcacid in chloroform sohition)/water (aqueous glucose solution) system was investigated.By using homemade device,the curves of various liquid membranes oscillation with different concentration of TTAB and picric acid,types of alcohol and other organic solvents at different temperature were measured.The results show that the water (aqueous 7 mmol/L of TTAB and 0.5 mol/L of n-propanol solution)/oil (0.5 mmol/L of picric acid in chloroform solution)/water (aqueous glucose solution) system performed sustained and stable oscillation at 30℃.And the novel system can recognise added amino acid.
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  Fabrication and biocompatible characterization of magnetic hollow capsules

  Hong Zhang, Xing Long Gong, Ling Yun Hao, Wan Quan Jiang

  中国化学快报. 2008, 19(07): 877-880. https://doi.org/10.1016/j.cclet.2008.05.002

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  Monodispersed Fe₃O₄/polypyrrole (PPy) hollow particles were synthesized via controllable in-sire deposition and polymerization techniques using poly(styrene-co-acrylic) (PSA) latex as template.Field-dependent magnetization plot illustrates that the capsules are superparamagnetic at 300 K.FTIR spectrum confirms that the myoglobin (Mb) molecule adsorbed on the surface of Fe₃O₄/PPy hollow particle essentially retains its native structure.Furthermore,direct electrochemistry of Mb can be realized on Fe₃O₄/PPy capsules modified pyrolytic graphite disk electrode,which indicates that the magnetic conductive polymer capsules can promote the electron transfer of protein.
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  Elimination of HBr from CH₃Br by Cu⁺ and Au⁺ :A DFT study

  Tao Hong Li, Chuan Ming Wang, Xiang Yi Liu, Xiao Guang Xie

  中国化学快报. 2008, 19(07): 881-884. https://doi.org/10.1016/j.cclet.2008.04.039

  摘要 ( ) PDF全文 ( ) 可视化 收藏

  The elimination of HBr from CH₃Br by ground state of Cu⁺ and Au⁺ has been investigated by using DFT methods.A mechanism of one-step HBr elimination leading to CuCH₂⁺ was identified.For the formation of AuCH₂⁺,besides the one-step mechanism,another two-step HBr elimination pathway through a C-Br bond insertion intermediate was also found,and this pathway is energetically more favorable than the one-step mechanism.The calculated reaction energy barriers show that the formation of AuCH₂⁺ is energetically much more favorable than the formation of CuCH₂⁺.The experimental observations are well explained.