Organocatalytic Asymmetric Synthesis of 1,1-Diarylethanes by Transfer Hydrogenation
作者:Zhaobin Wang、Fujin Ai、Zheng Wang、Wanxiang Zhao、Guangyu Zhu、Zhenyang Lin、Jianwei Sun
DOI:10.1021/ja510980d
日期:2015.1.14
organocatalytic transferhydrogenation strategy for the asymmetric synthesis of 1,1-diarylethanes is described. Under mild conditions, a range of 1,1-diarylethanes substituted with an o-hydroxyphenyl or indole unit could be obtained with excellent efficiency and enantioselectivity. We also extended the protocol to an unprecedented asymmetric hydroarylation of 1,1-diarylalkenes with indoles for the synthesis of
Retentive Solvolysis. 16. Reinvestigation of the Retentive Phenolysis of 1-Phenylethyl Chloride. The Mechanism and the Structure of Ion Pair Intermediate
chloride. The pattern C indicates that the first ion pair intermediate, not the second one, is nucleophilically attacked by solvent phenol molecule. The major products were the partially retained o-RC6H4OH, the partially inverted p-RC6H4OH, together with the partially retained ROPh. The same kp–kt pattern C has been observed for the competitive solvolysis of RCl in phenol–methanol (85:15 w/w), which produced
[DE] VERFAHREN ZUR HERSTELLUNG VON VERZWEIGTEN POLYCARBONATEN<br/>[EN] METHOD FOR PRODUCING BRANCHED POLYCARBONATES<br/>[FR] PROCEDE DE PRODUCTION DE POLYCARBONATES RAMIFIES
申请人:BAYER AKTIENGESELLSCHAFT
公开号:WO1999001495A1
公开(公告)日:1999-01-14
(DE) Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung von verzweigten Polycarbonaten nach dem Schmelzumesterungsverfahren, wobei als Verzweiger aliphatische Alkohole eingesetzt werden, sowie die nach dem Verfahren erhältlichen verzweigten Polycarbonate.(EN) The invention relates to a method for producing branched polycarbonates according to an interesterification method, wherein aliphatic alcohols are used as branching agents. The invention also relates to branched polycarbonates obtained according to the inventive method.(FR) L'invention concerne un procédé de production de polycarbonates ramifiés selon le procédé de transestérification par fusion, procédé selon lequel on utilise des alcools aliphatiques comme réticulant. L'invention concerne également les polycarbonates ramifiés obtenus selon ledit procédé.