Highly Enantioselective Transfer Hydrogenation of Fluoroalkyl Ketones
作者:Damjan Šterk、Michel Stephan、Barbara Mohar
DOI:10.1021/ol062358r
日期:2006.12.1
[Structure: see text] The asymmetric transferhydrogenation of fluoroalkyl ketones mediated by [Ru(eta6-arene)((S,S)-R2NSO2DPEN)] catalysts using HCO2H-Et3N afforded the corresponding alcohols with high ee's and in excellent yields.
DIASTEREOSELECTIVE REDUCTION OF PERFLUQROALKYLATED α,β-UNSATURATED KETONES WITH BAKER’S YEAST
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1984.587
日期:1984.4.5
The differentiation of a fluorinated group in the molecule with active fermenting yeast and the doubleasymmetricinduction in some perfluoroalkylated α,β-unsaturated ketones are described.
Synthesis of novel C2-symmetric chiral crownethers and their application to enantioselective trifluoromethylation of aldehydes and ketones are discussed. The use of a series of C2-symmetric chiral crownethers 2 or 3 derived from commercially available (R)-1,1′-bi-2-naphthol for the enantioselective trifluoromethylation of 2-naphthyl aldehyde 1a with (trifluoromethyl)trimethylsilane in the presence
Ferroelectric liquid crystal composition and liquid crystal device comprising the same
申请人:SHARP KABUSHIKI KAISHA
公开号:EP0469800A2
公开(公告)日:1992-02-05
A ferroelectric liquid crystal composition comprising at least one compound of the formula (I) :
wherein R1 is a straight or branched chain alkyl or alkoxy group having 1 to 15 carbon atoms
are, the same or different, a phenylene group which may be substituted by a halogen or a cyclohexylene group, X is a single bond or a vinyl or cyclopropylene group, Y is a methylene group or -COO- group, Z is a mono-, di- or trifluoromethyl group, m is an integer of 1 to 15 and R2 is a straight or branched chain alkyl group having 1 to 15 carbon atoms or a phenyl group, and a base liquid crystal material. This composition is used for a ferroelectric liquid crystal device .