CARBONYL SULFIDE INSERTION REACTIONS INTO METAL-ALKOXIDE BONDS - SYNTHESIS AND MOLECULAR-STRUCTURE OF DI[BIS(METHYLTHIOCARBONATO)TRIS(METHANOL)CALCIUM]

The reaction of COS gas with a suspension of [M(OMe)(2)](n) (M = Mg an d Ca) in methanol yields the insertion compounds, [M({OCS}OMe)(2)(MeOH )(x)](n) (M = Mg, 1, x = 2; M = Ca, 2, x = 3) in high yield; the magne sium compound is polymeric, whilst X-ray crystallography reveals that the calcium complex 2 is a centrosymmetric dimer with eight coordinate d calcium (II) ions and two distinct methylthiocarbonato (MTC) ligand coordination modes, the structural framework being stabilised by an ex tensive network of hydrogen bonding.