METALLOPHOSPHINITE COMPLEXES CPCP'TA(CO)(P(PH)(OME)) (CP'=ETA(5)-C5H5, ETA(5)-C5ME5, AND ETA(5)-C5ME4ET) AS PRECURSORS OF HETEROBIMETALLIC SYSTEMS - THE STEREOCHEMICAL ASPECTS

Treatment of [CpCp'Ta(CO)(PPhCiH)]Cl (Cp' = eta5-C5H5, eta5-C5Me5, or eta5-C5Me4Et, respectively Cp, Cp, and Cp+) with sodium methoxide res ults in the formation of metallophosphinite complexes CpCp'Ta(CO{P(Ph) (OMe)}. These compounds exhibit basic properties and Lewis acid fragme nts [H+ or Cr(CO)5(thf)] readily undergo coordination at the phosphoru s atom; formation of only one stereoisomer is observed. The heterobime tallic complex CpCp+Ta(CO){mu-P(Ph)(OMe)]Cr(CO)5 7c is structurally ch aracterized. Crystal data for 7c: a = 9.200(3) angstrom, b = 19.45(1) angstrom, c = 16.316(8) angstrom, beta = 90.42(3)-degrees, V = 2919.5 angstrom3, Z = 4, R = 0.033, Rw = 0.03, monoclinic, space group P2(1)/ n.