Abstract
The reaction of bulky ligand precursor 2,2′-methylenebis(4-methyl-6- tert-butylphenol) (H 2mbp) or 2,2′-ethylidenebis(4,6-di- tert-butylphenol) (H 2ebp) with trisdiolatotungsten(VI) complex [W(eg) 3] 1 (eg=ethanediolate dianion) provides heteroleptic complexes [W(mbp)(eg) 2] 2 or [W(ebp)(eg) 2] 3, respectively. Sterically less hindered 2,2′-dihydroxy-1,1′-dinaphtylmethane (H 2dinap) forms heteroleptic disubstituted complex [W(dinap) 2(eg)] 4. The X-ray crystal structure determinations confirmed that the isolated compounds are made of monomeric tris(diolato)tungsten(VI) molecules in which the central tungsten atom is bonded to six oxygen atoms forming a distorted octahedral coordination sphere around the metal ion. Complexes 2 and 3 catalyse the ring opening metathesis reaction of norbornene when activated by Et 2AlCl.
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