Diolates of dimolybdenum and ditungsten (M
M) 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.