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There are 129 papers published in subject: > since this site started. |
Results per page: | 129 Total, 13 Pages | << First < Previous 10 11 12 13 |
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1. Reactions of Si-H-Functionalized Cyclopentadienes with Ru3(CO)12 | |||
Chen Dafa ,Xu Shansheng ,Song Haibin ,Wang Baiquan | |||
Chemistry 08 November 2006 | |||
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Abstract:Thermal treatment of the Si-H-functionalized cyclopentadienes (R’C5H4)SiHMeR [R’= H, R= Ph (1), PhCH2 (2); R’= t-Bu, R= Ph (3), PhCH2 (4)] with Ru3(CO)12 gave the Si-H bond activated cyclic complexes trans-[(RMeSi)(η5-R’C5H3)Ru(CO)2]2 [R’= H, R= Ph (7), PhCH2 (8); R’= t-Bu, R= Ph (10), PhCH2 (11)] with two Si-Ru bonds. A cyclopentenyl complex [(η2-C5H7)SiMe(CH2Ph)Ru(CO)3]2 (9) was also obtained from the reaction. But reactions of ligands (C5Me4H)SiHMeR [R= Ph (5), PhCH2 (6)] with Ru3(CO)12 only gave the cyclic complex [(PhMeSi)(η5-C5Me4)]Ru2(CO)6 (12) with one Si-Ru bond, and the desilylation product [(η5-C5Me4H)Ru(CO)2]2 (13). The molecular structures of 7, 9, 12, and 13 were determined by X-ray diffraction. | |||
TO cite this article:Chen Dafa ,Xu Shansheng ,Song Haibin , et al. Reactions of Si-H-Functionalized Cyclopentadienes with Ru3(CO)12[OL].[ 8 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9368 |
2. Asymmetric Cyanosilylation of Aldehydes Catalyzed by a Chiral Bifunctional Amino Acid Ester-Ti(IV) Complex | |||
Wang Fei,Xiong Yan,Liu Xiaohua,Feng Xiaoming | |||
Chemistry 06 November 2006 | |||
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Abstract:A new chiral bifunctional catalyst had been developed for the asymmetric cyanosilylation of aldehydes. The complex of 1d with Ti(OiPr)4 could efficiently promote the addition of trimethylsilylcyanide to aldehydes in high yields (up to 99%) with up to 76% ee. Based on the preliminary investigation, a possible catalytic mechanism via dual activation has been proposed to explain the origin of the activation and asymmetric inductivity. | |||
TO cite this article:Wang Fei,Xiong Yan,Liu Xiaohua, et al. Asymmetric Cyanosilylation of Aldehydes Catalyzed by a Chiral Bifunctional Amino Acid Ester-Ti(IV) Complex[OL].[ 6 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9293 |
3. A general synthetic route to highly twisted 1,1′-dinaphthopyrans from dinaphthofuran | |||
Wang Bin ,Li Minxiong ,Xu Shansheng ,Song Haibin ,Wang Baiquan | |||
Chemistry 03 November 2006 | |||
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Abstract:The reaction of dinaphthofuran (1), lithium pieces (2.2 equiv), in dry ether led to a solution of the corresponding C,O-dilithiated intermediate 2 which, upon treatment with different ketones or aldehydes (0.8 equiv) at -78 oC, afforded, after hydrolysis and dehydration, highly twisted 1,1′-dinaphthopyrans 3 in good yields. The reaction undergoes reductive ring opening and cyclization, the intermediate diol 4c was isolated. | |||
TO cite this article:Wang Bin ,Li Minxiong ,Xu Shansheng , et al. A general synthetic route to highly twisted 1,1′-dinaphthopyrans from dinaphthofuran[OL].[ 3 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9243 |
4. Synthesis, Characterization and in vitro Antitumour Activity of Bis(butoxycarbonylmethyl)(4,7-Diphenyl-1,10-phenanthroline-N,N’)Tin Dibromide | |||
Xu Henan,Zhang Liting,Song Aihua,Hu Chun | |||
Chemistry 25 May 2006 | |||
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Abstract:The synthesis and characterization of bis(butoxycarbonylmethyl)(4,7-diphenyl-1,10-phenanthroline-N,N’)tin dibromide are reported. Its in vitro antitumour activity against two human tumour cell lines, WiDr, a colon carcinoma, and MCF-7, a mammary tumour, is higher than that of cisplatin. | |||
TO cite this article:Xu Henan,Zhang Liting,Song Aihua, et al. Synthesis, Characterization and in vitro Antitumour Activity of Bis(butoxycarbonylmethyl)(4,7-Diphenyl-1,10-phenanthroline-N,N’)Tin Dibromide [OL].[25 May 2006] http://en.paper.edu.cn/en_releasepaper/content/6797 |
5. Enantioselective Synthesis of Silicon Containing Cyanohydrin: (R)-2-trimethylsilyl-2-hydroxyl-ethycyanide by Oxynitrilase from Plum | |||
Liu Senlin,Zong Minhua,Huang Shunrong | |||
Chemistry 18 May 2006 | |||
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Abstract:The enantioselective transcyanation of acetyltrimethylsilane with acetone cyanohydrin catalyzed by (R)-oxynitrilases from plum seed meal in an aqueous/organic biphasic system for the preparation of (R)-2-trimethylsilyl-2-hydroxyl-ethylcyanide was successfully carried out. For optimization of the reaction, the influences of some important factors on the plum oxynitrilase-catalyzed reaction were investigated. Diisopropyl ether was found to be the best organic phase for the reaction among all the organic solvents explored. The optimal buffer pH and aqueous phase content were 5.0 and 13% (V/V), respectively, under which substrate conversion and product enantiomeric excess were 99% and 99%, respectively. | |||
TO cite this article:Liu Senlin,Zong Minhua,Huang Shunrong. Enantioselective Synthesis of Silicon Containing Cyanohydrin: (R)-2-trimethylsilyl-2-hydroxyl-ethycyanide by Oxynitrilase from Plum[OL].[18 May 2006] http://en.paper.edu.cn/en_releasepaper/content/6678 |
6. A Concise Asymmetric Total Synthesis of Obolactone | |||
Zhang Jiyong ,Li Yang ,Wang Wenkuan,She Xuegong ,Pan Xinfu | |||
Chemistry 09 March 2006 | |||
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Abstract:The first efficient asymmetric synthesis of obolactone 1 has been accomplished. | |||
TO cite this article:Zhang Jiyong ,Li Yang ,Wang Wenkuan, et al. A Concise Asymmetric Total Synthesis of Obolactone[OL].[ 9 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5615 |
7. Enantioselective total synthesis of Aigialomycin D | |||
Lu Jiangping ,Ma Junying ,Xie Xingang ,Chen Bo | |||
Chemistry 14 February 2006 | |||
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Abstract:An efficient, convergent approach for the total synthesis of aigialomycin D (1) is described. Key features of the synthetic strategy include (a) Sharpless asymmetric epoxidation reaction and selective opening 2,3-epoxy alcohol to elaborate the two hydroxy-bearing stereogenic centers at C5’and C6’ position; (b) Kocienski modified Julia protocol to construct the two E-configured double bonds; (c) Yamaguchi macrolactonization to acccess the 14-membered macrocyclic ring. | |||
TO cite this article:Lu Jiangping ,Ma Junying ,Xie Xingang , et al. Enantioselective total synthesis of Aigialomycin D[OL].[14 February 2006] http://en.paper.edu.cn/en_releasepaper/content/5229 |
8. (Salen)Ti(IV)-Catalyzed Asymmetric Ring-opening of Monosubstituted Epoxides with Dithiophosphorus Acid | |||
Zhou Zhenghong,Wang Quanyong,Liu Bing ,Guofeng Zhao,Qilin Zhou,Chuchi Tang | |||
Chemistry 24 November 2005 | |||
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Abstract:The asymmetric ring-opening of monosubstituted epoxides with dithiophosphorus acids catalyzed by a (salen)Ti(IV) complex formed in situ from the reaction of Ti(OPr-i)4 and the chiral salen ligand derived from (1R,2R)-(+)-diaminocyclohexane and (R)-2,2’-diamino-1,1’- binaphthalene was realized. The resulting products were obtained with moderate enantioselectivity (up to 59% ee). High regioselectivity was observed for the alkyl substituted epoxides, whereas poor regioselectivity was obtained for the aryl substituted epoxides. | |||
TO cite this article:Zhou Zhenghong,Wang Quanyong,Liu Bing , et al. (Salen)Ti(IV)-Catalyzed Asymmetric Ring-opening of Monosubstituted Epoxides with Dithiophosphorus Acid[OL].[24 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3769 |
9. Low and wide phase transition temperature dimesogenic compounds consisting of a cholesteryl and 4-( trans- 4-n-alkylcyclohexyl) phenoxy mesogens | |||
Chunbo Zhang,Zhiqi Cong,Bingzhu Yin | |||
Chemistry 30 May 2005 | |||
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Abstract:Unsymmetrical dimesogenic compounds having cholesteryl and 4-trans- (4-n -alkylcyclohexyl) phenoxy group were synthesized by condensation of cholesterylω-bromopentanoates with appropriate 4-trans- (4-n-alkylcyclo- hexyl) phenols. Structures and thermal phase behaviour of these dimers have been confirmed by IR, 1H NMR , elemental analysis,DSC,polarity microscopy and XRD measurements. Their thermal phase behaviour is significantly different to that of other cholesterol-based liqud crystalline dimmers which having low and wide phase transition temperature. | |||
TO cite this article:Chunbo Zhang,Zhiqi Cong,Bingzhu Yin. Low and wide phase transition temperature dimesogenic compounds consisting of a cholesteryl and 4-( trans- 4-n-alkylcyclohexyl) phenoxy mesogens[OL].[30 May 2005] http://en.paper.edu.cn/en_releasepaper/content/2124 |
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