Diolates of dimolybdenum and ditungsten (MM) with seven-, eight- and nine-membered rings

Abstract

The use of the bulky diols, H₂L¹= 2,5-dimethylhexane-2,5-diol and H₃L²= 2,2′-methylenebis(6-tert-butyl-p-cresol) in reactions with M₂(NMe₂)₆(MM) compounds leads to dinuclear diolates M₂(L¹)₃(HNMe₂)₂1, M₂(L¹)₃2, Mo₂(NMe₂)₂-(HL²)3 having seven-, eight- and nine-membered rings and W₂(µ-H)(µ-NMe₂)(NMe₂)(HNMe₂)(HL²)(L²), 4, where L² is the anionic ligand derived from cyclometallation at the methylene carbon atom; the compounds 1 and 2 where M = W, 3, and 4 have been structurally characterized.