Insertion of CS2 into the Group 2 metal–alkoxide bonds of [{M(OR)2}n] (M = Mg, Ca, Sr or Ba; R = Et or Pri); crystal structures of [Ca(S2COPri)2(PriOH)3]·2PriOH and [{Ba(S2COEt)2}∞]

Abstract

The insertion of carbon disulfide into the M–O bonds of the alkaline-earth-metal ethoxides and isopropoxides has been studied. The resulting products have been characterised by IR, ¹H and ¹³C NMR spectroscopy, mass spectrometry and thermogravimetric analysis. Two of these complexes have been structurally characterised by single crystal X-ray crystallography and the data have confirmed the insertion of CS₂ into both Ba–O bonds of [{Ba(OEt)₂(EtOH)₄}_n] giving the polymer [{Ba(S₂COEt)₂}_∞] and into both Ca–O bonds of [{Ca(OEt)₂(EtOH)₄}_n] giving the monomer [Ca(S₂COPrⁱ)₂(PrⁱOH)₃]·2PrⁱOH.