AbstractLewis‐base‐catalyzed asymmetric hydrosilylation of substituted benzophenone N‐aryl imines was investigated. Among various chiral Lewis‐base catalysts, a catalyst derived from L‐Serine was found to be the most favorable one which promote the reaction to afford a series of (diarylmethyl)amines with high yields (up to 97 %) in moderate to good enantioselectivities (up to 97 % ee). The absolute configuration of the product was determined by the X‐ray crystallographic analysis.magnified image
YULDASHEV X. YU., DOKL. AN UZSSR, 1977, HO 11, 50-51
作者:YULDASHEV X. YU.
DOI:——
日期:——
POLYIMIDE-CO-POLYBENZOXAZOLE COPOLYMER, PREPARATION METHOD THEREOF, AND GAS SEPARATION MEMBRANE COMPRISING THE SAME
申请人:Lee Young Moo
公开号:US20110065823A1
公开(公告)日:2011-03-17
Disclosed herein are a polyimide-polybenzoxazole copolymer, a method for preparing thereof and a gas separation membrane comprising the same. More specifically, provided are a polyimide-polybenzoxazole copolymer simply prepared through thermal-rearrangement performed by thermally treating a polyimide-poly (hydroxyimide) copolymer as a precursor, a method for preparing the same, and a gas separation membrane comprising the same. The copolymer shows superior gas permeability and gas selectivity, thus being suitable for use in gas separation membranes in various forms such as films, fibers or hollow fibers. The gas separation membrane thus prepared can advantageously endure even harsh conditions such as long operation time acidic conditions and high humidity due to the rigid polymer backbone present in the copolymer.
US8821617B2
申请人:——
公开号:US8821617B2
公开(公告)日:2014-09-02
Enantioselective Lewis-Base-Catalyzed Asymmetric Hydrosilylation of Substituted Benzophenone<i>N</i>-Aryl Imines: Efficient Synthesis of Chiral (Diarylmethyl)amines
AbstractLewis‐base‐catalyzed asymmetric hydrosilylation of substituted benzophenone N‐aryl imines was investigated. Among various chiral Lewis‐base catalysts, a catalyst derived from L‐Serine was found to be the most favorable one which promote the reaction to afford a series of (diarylmethyl)amines with high yields (up to 97 %) in moderate to good enantioselectivities (up to 97 % ee). The absolute configuration of the product was determined by the X‐ray crystallographic analysis.magnified image
Baker et al., Journal of the Chemical Society, 1945, p. 27,29