Complexes containing bridging tin- and germanium-substituted metallocarboxylate ligands from the reactions of Ph 3SnOH and Ph 3GeOH with Os 3(CO) 12 in the presence of base

Abstract

The first examples of bridging tin- and germanium-substituted metallocarboxylate ligands have been obtained from the reactions of Ph 3SnOH and Ph 3GeOH with Os 3(CO) 12 under basic conditions. Two products: Os 3(CO) 10(μ-η 2-O=COSnPh 3)(μ-OMe), 1 (18% yield) and Os 3(CO) 10(μ-OMe)(μ-OH), 2 (6.9% yield) were obtained from the reaction of Ph 3SnOH with Os 3(CO) 12 in the presence of [Bu 4N]OH in methanol solvent. The compound Os 3(CO) 10(μ-η 2-O=COGePh 3)(μ-OMe), 3 (7.3% yield) was prepared similarly by using Ph 3GeOH in place of Ph 3SnOH. Each of the products 1– 3 were characterized structurally by single-crystal X-ray diffraction analysis. Compounds 1 and 3 each contain an μ-η 2-O=COMPh 3, M = Sn or Ge ligand bridging a pair of osmium atoms in a triosmium carbonyl cluster complex.