ONE-POT SYNTHESIS OF GROUP 8 TRANSITION METAL CARBENE COMPLEXES USEFUL AS OLEFIN METATHESIS CATALYSTS

摘要

The invention provides a novel method for synthesizing transition metal carbene complexes useful as olefin metathesis catalysts. The method is a convenient one-pot synthesis in which transition metal carbenes are prepared in high yield from readily aavialable starting materials via a dihydrogen complex containing two different anionic ligangs, preferably a phosphine and an N-heterocyclic carbene. The invention additionally provides a method for synthesizing precursors to carbene ligands useful, inter alia, in the aforementioned one-pot synthesis. The precursors are in the form of trichloromethyl adducts of the formula L<1>-CCI3, where L<1> is a carbene ligand, and are prepared by contacting an unsaturated, ionized analog of L-CCI3 with a non-nucleophilic base in the presence of chloroform.