A process for the preparation of 3-(2-guanidinothiazol-4-yl-methylthio)propionitrile
申请人:CENTRO MARGA PARA LA INVESTIGACION S.A.
公开号:EP0284536A1
公开(公告)日:1988-09-28
The present invention describes a beta-cyanoethylation process of thiol-compounds by acrylonitrile, for the preparation of 3-(2-guanidinothiazol-4-yl-methylthio)propionitrile, in an aqueous-methanolic medium.
Highly active immobilized ruthenium catalysts, which can be used for oxidation of alcohols and sulfides, were developed on the basis of the polymer-micelle incarcerated (PMI) method. The catalysts could be recovered and reused several times without loss of activity and no metal leaching was observed. Selection of micelle-forming conditions and polymer structures were key in achieving high activities. TEM and SEM analyses were conducted to observe the structures of PMI-Ru. (c) 2005 Elsevier Ltd. All rights reserved.
Formation of Nanoarchitectures Including Subnanometer Palladium Clusters and Their Use as Highly Active Catalysts
Subnanometer Pd clusters stabilized within micelles of random copolymers were formed by direct immobilization of Pd(0) via ligand exchange. The clusters were estimated to contain approximately seven Pd atoms on average (cluster diameter approximate to 0.7 nm). Several Pd-containing micelle morphologies could be obtained by polymer cross-linking. These micelles containing Pd clusters were demonstrated to be efficient catalysts for hydrogenations and Heck reactions.
Polyether-polyamide block copolymer and polyether prepolymer