The alkylation of aromatic compounds, such as benzene, toluene, chlorobenzene, and naphthalene, with optically active (S)-alkyl 2-(sulfonyloxy)propionates and (R)-alkyl 3-(sulfonyloxy)butanoates in the presence of AlCl3 afforded optically active (S)-alkyl 2-arylpropionates and (S)-alkyl 3-arylbutanoates in fair to good chemical yields (40-84%) and in good to excellent optical yields (61-97%). As usually occurs in Friedel-Crafts alkylation reactions, poor regioselectivity was observed.
US4874544A
申请人:——
公开号:US4874544A
公开(公告)日:1989-10-17
Ferroelectric liquid crystals
申请人:VEB Werk fuer Fernsehelektronik im VEB Kombinat Mikroelektronik
公开号:US04874544A1
公开(公告)日:1989-10-17
Fast-switching displays with memory properties are provided, which can display digits, symbols, and images, and which contain as chemically and thermally stable ferroelectric liquid crystalline substances, according to the invention, liquid crystalline derivatives which contain a chiral alkyl halide residue corresponding to the general formula ##STR1## are used in mixtures of one another as well as in conjunction with other liquid crystalline or non-crystalline liquid substances.
Stereochemical Studies of the Opening of Chloro Vinyl Epoxides: Cyclic Chloronium Ions as Intermediates
作者:Andrej Shemet、David Sarlah、Erick M. Carreira
DOI:10.1021/acs.orglett.5b00558
日期:2015.4.17
A systematic study of the opening of a collection of chlorinated vinyl epoxides is reported, which includes experiments that implicate both five- and four-membered chloronium ions as plausible intermediates in this type of epoxideopening reaction.