87322-47-2Relevant academic research and scientific papers
METALLACYCLOBUTADIENE COMPLEXES FROM LIGAND COMBINATION OF CS AND ACETYLENE ON OSMIUM
Elliott, G. P.,Roper, W. R.
, p. C5 - C8 (1983)
The zerovalent thiocarbonyl Os(CS)(CO)(PPh3)3 reacts with the disubstituted acetylene PhCCPh to give an equal mixture of the metallacycle and the coordinatively unsaturated acetylene complex Os(η2-PhCCPh)(CS)(PPh3)2.Addition of CO converts the latter compound to the metallacycle which is readily alkylated on S to give, formally, a metallacyclobutadiene, e.g. .HCl addition to Os(η2-PhCCPh)(CS)(PPh3)2 gives a coordinatively unsaturated monohapto-vinyl derivative OsCl(η1-CPh=CHPh)(CS)(PPh3)2.This complex adds CNR (R=p-tolyl) forming a six-coordinate complex OsCl(η1-CPh=CHPh)(CS)(CNR)(PPh3)2 but uptake of CO is accompanied by immediate rearrangement to the dihapto-thioacyl, Os(η2-C-CPh=CHPh)Cl(CO)(PPh3)2.
