Asymmetric synthesis of chiral, nonracemic dialkyl-α-, β-, and γ-hydroxyalkylphosphonates via a catalyzed enantioselective catecholborane reduction
摘要:
A highly enantioselective synthesis of dialkyl alpha-hydroxyphosphonates achieved by a oxazaborolidine catalyzed reduction with catecholborane starting with m-ketophosphonates is described. Both alpha-aryl- and alpha-alkylketophosphonates were reduced using the (S)-enantiomer of the catalyst 4 leading also to the (S)-configuration in the products 2. The reaction gave good chemical yields and excellent enantiomeric excesses (up to >99 % ee).
Method of preparing oligomers of conjugated dienes with an iron-based catalyst composition
申请人:Bridgestone Corp.
公开号:US20030073570A1
公开(公告)日:2003-04-17
A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) (i) a halogen-containing iron compound or (ii) an iron-containing compound and a halogen-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.
一种催化剂组合物,它是由以下成分的组合或反应产物组成的:(a) (i) 含卤素的铁化合物或 (ii) 含铁化合物和含卤素的化合物,(b) &agr;-酰基膦酸二酯,和 (c) 有机铝化合物。
Iron-based catalyst composition for the manufacture of syndiotactic 1, 2-polybutadiene
申请人:Bridgestone Corp.
公开号:US20030073790A1
公开(公告)日:2003-04-17
A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) an iron-containing compound, (b) an &agr;-acylphosphonate diester, and (c) an organoaluminum compound.