MoO(OMe)4 has been prepared by anodic oxidation of molybdenum metal in
anhydrous methanol containing LiCl as an electrolyte. The X-ray singl
e crystal study showed the complex to consist of pseudo-centrosymmetri
c dimeric molecules, [MoO(OMe)3(mu-OMe)]2. The general effect of the M
(mu-OR)2M ring upon the arrangement of bonds with increased multiplici
ty is discussed in this and related molecules.