[EN] METAL COMPLEXES FOR USE IN OLEFIN METATHESIS AND ATOM GROUP TRANSFER REACTIONS [FR] COMPLEXES METALLIQUES S'UTILISANT DANS LA METATHESE D'OLEFINE ET LES REACTIONS DE TRANSFERT D'ATOMES OU DE GROUPES
High activity metal carbene metathesis catalysts generated using a thermally activated N-heterocyclic carbene precursor
申请人:——
公开号:US20030083445A1
公开(公告)日:2003-05-01
The invention provides a method for converting a less active or slower to initiate system to a higher activity system so that at the end of a polymerization the most active species is present in the system. The invention generally relates to a process for converting a less active or slower to initiate catalyst system to a higher activity catalyst system wherein the process comprises contacting a protected N-heterocyclic carbene with a metathesis catalyst and an olefin in the presence of energy. One of the benefits of the invention is that the amount of catalyst required is less than or lowered in the presence of the protected N-heterocyclic carbene as compared to the amount of catalyst required in the absence of the protected N-heterocyclic carbene. The protected N-heterocyclic carbene can be unsaturated or saturated. In addition, the invention describes novel ruthenium initiators and methods of making the same.
HIGH ACTIVITY METAL CARBENE METATHESIS CATALYSTS GENERATED USING A THERMALLY ACTIVATED N-HETEROCYCLIC CARBENE PRECURSOR
申请人:California Institute of Technology
公开号:EP1372844A1
公开(公告)日:2004-01-02
EP1372844A4
申请人:——
公开号:EP1372844A4
公开(公告)日:2005-10-12
US6838489B2
申请人:——
公开号:US6838489B2
公开(公告)日:2005-01-04
[EN] HIGH ACTIVITY METAL CARBENE METATHESIS CATALYSTS GENERATED USING A THERMALLY ACTIVATED N-HETEROCYCLIC CARBENE PRECURSOR<br/>[FR] CATALYSEURS METALLIQUES DE METATHESE DE CARBENE A HAUTE ACTIVITE GENERES AU MOYEN D'UN PRECURSEUR DE CARBENE N-HETEROCYCLIQUE ACTIVE DE MANIERE THERMIQUE
申请人:CALIFORNIA INST OF TECHN
公开号:WO2002076613A1
公开(公告)日:2002-10-03
The invention provides a method of making a ruthenium or osmium carbene catalyst having an imidazolidine in the presence of an olefin with the application of energy. The resulting metal compound has two carbene ligands, one from the original carbene, the other from the imidazolidine. The imidazolidine has bulky protecting groups in the two positions adjacent to the carbene carbon. The method of making the imidazoline from the salt in the presence of a base and chloroform is also disclosed.