Substitution reactions of secondary halides and epoxides with higher order, mixed organocuprates, R2Cu(CN)Li2: synthetic, stereochemical, and mechanistic aspects
Rhodium(I)/Diene-Catalyzed Addition Reactions of Arylborons with Ketones
作者:Yuan-Xi Liao、Chun-Hui Xing、Qiao-Sheng Hu
DOI:10.1021/ol300275s
日期:2012.3.16
Rh(I)/diene-catalyzed additionreactions of arylboroxines/arylboronic acids with unactivated ketones to form tertiary alcohols in good to excellent yields are described. By using C2-symmetric (3aR,6aR)-3,6-diaryl-1,3a,4,6a-tetrahydropentalenes as ligands, the asymmetric version of such an additionreaction, with up to 68% ee, was also realized.
描述了 Rh(I)/二烯催化的芳基环硼氧烷/芳基硼酸与未活化酮形成叔醇的加成反应,收率很好。通过使用C 2 -对称 (3a R ,6a R )-3,6-二芳基-1,3a,4,6a-四氢戊烯作为配体,这种加成反应的不对称形式,具有高达 68% ee,也实现了。
Azo anions in synthesis
作者:Jack E. Baldwin、Robert M. Adlington、Jeffery C. Bottaro、Jayant N. Kolhe、Ian M. Newington、Matthew W.D. Perry
DOI:10.1016/s0040-4020(01)87648-1
日期:1986.1
The lithium salts of trityl- and diphenyl-4-pyridylmethyl-hydrazones of both aldehydes and ketones react with electrophiles (alkyl halides, aldehydes, ketones, crotonates) at low temperature to form C-trapped azo compounds ; these Intermediates decompose homolytically with loss of nitrogen below room temperature and can be diverted in a synthetically useful way to alkanes, alkenes, alcohols or saturated
Air-Assisted Addition of Grignard Reagents to Olefins. A Simple Protocol for a Three-Component Coupling Process Yielding Alcohols
作者:Youhei Nobe、Kyohei Arayama、Hirokazu Urabe
DOI:10.1021/ja055732b
日期:2005.12.1
example, (trimethylsilyl)methylmagnesium chloride and alpha-methylstyrene in ether at room temperature under dry air directly furnished 2-phenyl-4-(trimethylsilyl)-2-butanol in good yield. As the Grignard addition to olefins under argon with rigorous exclusion of O2 did not proceed at all, the above reaction should involve a radical mechanism: an alkyl radical generated by the aerial oxidation of the
Optically active compound and ferroelectric liquid crystal composition containing the same
申请人:ARAKAWA KAGAKU KOGYO KABUSHIKI KAISHA
公开号:EP0370497A1
公开(公告)日:1990-05-30
An optically active compound of the formula:
wherein R¹ is an alkyl or alkyloxy group, Y is a halogen atom, cyano group, nitro group, methyl group, hydrogen atom or trifluoromethyl group, and A is nitro group, cyano group, carboxyl group, hydrogen atom, a halogen atom, an alkyl group, an alkyloxy group, -CO-R² or
in which R² is an alkyl or alkyloxy group and Y is as defined above, which is useful as an additive for liquid crystals and can provide a ferroelectric liquid crystal composition when added to smectic liquid crystals, and which also provide a chiral nematic liquid crystal composition when added to nematic liquid crystals.