PLATINUM(II) AND PALLADIUM(II) COMPLEXES OF THIACYCLOOCT-4-ENES; AN UNUSUAL METAL-CATALYZED OLEFIN ISOMERIZATION

Article abstract of DOI:10.1016/S0022-328X(00)82421-3

Reactions of MCl4^2- (M=Pd, Pt) with cis-thiacyclooct-4-ene, cis-2-methyl-thiacyclooct-4-ene and cis-2-phenylthiacyclooct-4-ene (cis-S-4-oct) give chelate complexes of general formula MCl2(cis-S-4-oct).X-ray structure determination indicates that coordination to the metal occurs through both the olefinic double bond and the sulfur atom.Reaction of CN^- with the adduct obtained from PtCl4^2- and a mixture of cis- and trans-2-methylthiacyclooct-4-ene liberates the cis ligand, and GLC analysis excludes the presence of free trans olefin.It is suggested that platinum complexes induce extensive trans<*>cis olefin isomerization.