Chemistry of o-Xylidene-Metal Complexes. Part 3.' Tungsten o-Xylidene Complexes derived from Tetrachloro(oxo)tungsten(vl) ; X-Ray Crystal Structures of [~( C H 2 C 6 H 4~H z -o )~]~~.~~~~6 and [{~(CH2C,H4CH2=~)20}2~g(C4H*0)41*

Abstract

Reaction of WCI4O with the di-Grignard reagent O-C&(CH2MgC1)2 or the chloride-free ' o-xylidene ' complex Mg(CH2C6H4CH2-o) (thf) in tetrahydrofuran (thf) yields either the thermally stable tris(chelate), [We use the umbrella term ' o-xylidenemetal complex ' to describe, without prejudice as to bonding, all O-C~I&(CH~)~-metal complexes in which the organic ligand binds in (a) a bridging mode, as i