The reactivity of metal—metal bonds VIII. A comparative study of the SiFe, GeFe and SnFe bonds, and some further reactions of the SnMn bond

Abstract

The reactions of (CH 3) 3SnMn(CO) 5 with perfluoropropene, perfluoro-2-butyne and perfluorocyclobutene are described. Similar reactions of (CH 3) 3MFe(CO) 2(π-C 5H 5) (M = Si, Ge, or Sn) with perfluorocyclobutene, perfluoro-2-butyne, and 3,3,3-trifluoropropyne are described, leading to the characterization of insertion products of the types (CH 3) 3M(CF 3)CC(CF 3)Fe(CO) 2(π-C 5H 5) and (CH 3) 3MC 2H(CF 3)Fe(CO) 2(π-C 5H 5). When M = Sn, other products formed by the elimination of trimethyltin fluoride from 1/1 insertion products, are also formed. The mechanisms of these reactions appear to involve four-centred type transition species.