Exchange of one PCy3 unit of the classical Grubbs catalyst 1 by N-heterocycliccarbene (NHC) ligands leads to "second-generation" metathesis catalysts of superior reactivity and increased stability. Several complexes of this type have been prepared and fully characterized, six of them by X-ray crystallography. These include the unique chelate complexes 13 and 14 in which the NHC- and the Ru-CR entities
Simple New Three-component Catalytic System for Enyne Metathesis
作者:Lutz Ackermann、Christian Bruneau、Pierre H. Dixneuf
DOI:10.1055/s-2001-11394
日期:——
A new active three-component catalytic system for enyne metathesis is reported. It is easily generated in situ by combination of [RuCl2(p-cymene)]2, 1,3-bis(mesityl)imidazolium chloride and Cs2CO3 and exhibits excellent performance for the intramolecular metathesis reaction even from highly substituted enynes.