Reactions of the mixed-metal clusters prepared from tungsten acetylide complexes; X-ray structural analyses of two novel butterfly clusters with 60 valence electrons

Abstract

Reaction of WL(CO)₃CCPh and Os₃(CO)₁₀(C₂R₂) produced WOs₃L(CO)₉(µ₃-CPh)(CCRCR), L = Cp, R = Tol (p-MeC₆H₄)1a; L = C₅Me₅, R = Me, 1b; treatment of complexes 1 with ditolylacetylene yielded planar clusters WOs₃L(CO)₈(µ₃-CPh)[C(Tol)C(Tol)CCRCR], L = Cp, R = Tol, 2a; L = C₅Me₅, R = Me, 2b; complex 2b underwent reversible loss of CO to produce an unsaturated cluster WOs₃C₅Me₅(CO)₇(µ₃-CPh)[CMeCMeCC(Tol)C(Tol)]3b; thermolysis of 3b in refluxing xylene induced the rearrangement of the cluster core, giving another unsaturated complex 4b with identical molecular formula; complexes 1a, 3b and 4b have been examined by X-ray diffraction studies.