申请人:California Institute of Technology
公开号:US06759537B2
公开(公告)日:2004-07-06
The present invention relates to novel hexacoordinated metathesis catalysts and to methods for making and using the same. The inventive catalysts are of the formula
wherein:
M is ruthenium or osmium;
X and X1 are the same or different and are each independently an anionic ligand;
L, L1′ and L2 are the same or different and are each independently a neutral electron donor ligand, wherein at least one L, L1′ and L2 is an N-heterocyclic carbene ligand; and,
R and R1 are each independently hydrogen or a substituent selected from the group consisting of C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, aryl, C1-C20 carboxylate, C1-C20 alkoxy, C2-C20 alkenyloxy, C2-C20 alkynyloxy, aryloxy, C2-C20 alkoxycarbonyl, C1-C20 alkylthio, C1-C20 alkylsulfonyl and C1-C20 alkylsulfinyl. Optionally, each of the R or R1 substituent group may be substituted with one or more moieties selected from the group consisting of C1-C10 alkyl, C1-C10 alkoxy, and aryl which in turn may each be further substituted with one or more groups selected from a halogen, a C1-C5 alkyl, C1-C5 alkoxy, and phenyl. Moreover, any of the catalyst ligands may further include one or more functional groups. Examples of suitable functional groups include but are not limited to: hydroxyl, thiol, thioether, ketone, aldehyde, ester, ether, amine, imine, amide, nitro, carboxylic acid, disulfide, carbonate, isocyanate, carbodiimide, carboalkoxy, carbamate, and halogen.
本发明涉及新型六配位的换位催化剂以及制备和使用该催化剂的方法。创新的催化剂具有以下化学式:其中:M为钌或锇;X和X1相同或不同,各自独立地为阴离子配体;L、L1'和L2相同或不同,各自独立地为中性电子给体配体,其中至少一个L、L1'和L2为N-杂环卡宾配体;R和R1各自独立地为氢或从C1-C20烷基、C2-C20烯基、C2-C20炔基、芳基、C1-C20羧酸酯、C1-C20烷氧基、C2-C20烯氧基、C2-C20炔氧基、芳氧基、C2-C20烷氧羰基、C1-C20烷硫基、C1-C20烷基磺酰基和C1-C20烷基亚磺酰基的取代基中选择的取代基。可选地,R或R1取代基中的每个基团可被从C1-C10烷基、C1-C10烷氧基和芳基的取代基中选择的一个或多个基团所取代,而这些基团又可以进一步被从卤素、C1-C5烷基、C1-C5烷氧基和苯基中选择的一个或多个基团所取代。此外,任何催化剂配体中还可以包括一个或多个功能基团。适用的功能基团示例包括但不限于:羟基、硫醇、硫醚、酮、醛、酯、醚、胺、亚胺、酰胺、硝基、羧酸、二硫键、碳酸酯、异氰酸酯、碳酸酯、碳酸酯、卤素。