Novel bimetallic group 9 metal catalysts containing P,S-chelating o-carboranyl ligand system for the carbonylation of methanol

A series of novel group 9 transition metal complexes containing a P,S-chela ting ligand have been prepared. The bimetallic rhodium carbonyl complex is much more effective in catalyzing the carbonylation of methanol to acetic a cid than the previously known catalyst, [RhI2(CO)(2)](-).