Some complexes containing carbon chains end-capped by M(CO)(2)Tp ' [M = Mo, W; Tp '= HB(pz)(3), HB(dmpz)(3)] groups

Abstract

Complexes M({triple bond, long}CC{triple bond, long}CSiMe3)(CO)2Tp′ (Tp′ = Tp [HB(pz)3], M = Mo 2, W 4; Tp′ = Tp* [HB(dmpz)3], M = Mo 3) are obtained from M({triple bond, long}CC{triple bond, long}CSiMe3)(O2CCF3)(CO)2(tm eda) (1) and K[Tp′].Reactions of 2 or 4 with AuCl(PPh3)/K2CO3 in MeOH afforded M{{triple bond, long}CC{triple bond, long}CAu(PPh3)}(CO)2Tp′ (M = Mo 5, W 6) containing C3 chains linking the Group 6 metal and gold centres.In turn, the gold complexes react with Co3(μ3-CBr)(μ-dppm)(CO)7 to give the C4-bridged {Tp(OC)2M}{triple bond, long}CC{triple bond, long}CC{triple bond, long}{Co3(μ-dppm)(CO)7} (M = Mo 7, W 8), while Mo({triple bond, long}CBr)(CO)2Tp* and Co3{μ3-C(C{triple bond, long}C)2Au(PPh3)}(μ-dppm)(CO)7 give {Tp*(OC)2Mo}{triple bond, long}C(C{triple bond, long}C)2C{triple bond, long}{Co3(μ-dppm)(CO)7} (9) via a phosphine-gold(I) halide elimination reaction. The C3 complexes Tp′(OC)2M{triple bond, long}CC{triple bond, long}CRu(dppe)Cp* (Tp′ = Tp, M = Mo 10, W 11; Tp′ = Tp*, M = Mo 12) were obtained from 2-4 and RuCl(dppe)Cp* via KF-induced metalla-desilylation reactions. Reactions between Mo({triple bond, long}CBr)(CO)2Tp* and Ru{(C{triple bond, long}C)nAu(PPh3)}(dppe)Cp* (n = 2, 3) afforded {Tp*(OC)2Mo}{triple bond, long}C(C{triple bond, long}C)n{Ru(dppe)Cp*} (n = 2 13, 3 14), containing C5 and C7 chains, respectively. Single-crystal X-ray structure determinations of 1, 2, 7, 8, 9 and 12 are reported. © 2006 Elsevier B.V. All rights reserved.