title: Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complex.
abstract: The reaction of a silsesquioxane trisilanol with methylmagnesium chloride leads to an unprecedented tetranuclear magnesium silsesquioxane complex 1 in high yield. The crystal structure shows an unusually short Mg-Cl bond, indicative of an electron-deficient magnesium atom; 1 has been used as transmetalation agent for the synthesis of metal silsesquioxane complexes. Transmetalation activity was low, but can easily be followed by multinuclear NMR. Crystal data for 1: C(78)H(142)Cl(2)Mg(4)O(26)Si(14).6(C(4)H(8)O), a = 15.744(1) A, b = 26.526(2) A, c = 16.917(1) A, beta = 113.229(2) degrees, monoclinic, P2(1)/n, Z = 2.
authors.affiliation: Schuit Institute of Catalysis, Eindhoven University of Technology, PO Box 513, NL-5600 MB Eindhoven, The Netherlands.
authors.forename: R W
authors.initials: RW
authors.lastname: Hanssen
authors.forename: A
authors.initials: A
authors.lastname: Meetsma
authors.forename: R A
authors.initials: RA
authors.lastname: van Santen
authors.forename: H C
authors.initials: HC
authors.lastname: Abbenhuis