Attack of isocyanide and carbon monoxide on a bridging alkylidyne ligand at a ditungsten centre. Cleavage of the C–N and C–O triple bonds with respective formation of tungsten–imido and -oxo groups and concomitant addition of the carbon atom to the bridging alkylidyne carbon yielding a bridging σ-W1,η2-W2 alkynyl ligand
Abstract
Isocyanide ligands and carbon monoxide, CX, where X = NBut, NC6H3Me2-2,6, O, react in hydrocarbon solvents with [PriO)2W(µ-CSiMe3)]2 to give compounds of formula (PriO)(X)W(µ-CSiMe3)(µ-η2, η1-CCSiMe3W(OPri)3; the compound where X = 2,6-dimethylPhenylimido has been characterized by an X-ray study while that for X = O is formulated as an analouge based on i.r. and n.m.r. data.