Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complex.
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.
Hanssen
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RW
Schuit Institute of Catalysis, Eindhoven University of Technology, PO Box 513, NL-5600 MB Eindhoven, The Netherlands.
Meetsma
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A
van Santen
R A
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Abbenhuis
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