Two complexes containing 19-atom chains linking metal centres

The first example of a complex containing a C-19 chain, {Co-3(mu-dppm)(CO7)} {mu(3)-C(C C)(9)} {W(CO)(3)Cp}, has been prepared in 22% yield from the Pd(0) / Cu(I)-catalysed reaction between I(C C)(3)I, W{C CC CAu(PPh3)}(CO)(3)Cp and Co-3{mu(3)-C(C C)(4)Au(PPh3)}(mu-dppm)(CO)(7). Other products also formed include (Co-3{mu-dppm)(CO)(7)}(mu(3)-C(C C)(6)}{W(CO)(3)Cp} (32%), {Co-3(mu-dppm)(CO)(7)}(2){mu(3):mu(3)-C(C C)(x)C} [x = 8 (6%) and 11 (5%)], containing respectively C-13, C-18 and C-24 chains, and {W(CO)(3)Cp}(2)(mu-(C C)(x)} (x = 4, 7) (traces). A second example of a 19-atom chain is found in Hg{(C C)(4)C[Co-3(mu-dppm)(CO)(7)]}(2), obtained in 24% yield from the reaction between Hg(OAc)(2) and Co-3{mu(3)-C(C C)(4)SiMe3} (mu-dppm)(CO)(7) in the presence of NaOMe. To cite this article: M.L Bruce et al., C R. Chimie 12 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.