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A Ruthenium Dihydrogen Germylene Complex and the Catalytic Synthesis of Digermoxane

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posted on 24.08.2015, 00:00 by Katharine A. Smart, Emmanuelle Mothes-Martin, Laure Vendier, Robin N. Perutz, Mary Grellier, Sylviane Sabo-Etienne
A germylene complex with a labile η2-H2 coligand, [RuH2(GePh2)­(η2-H2)­(PCy3)2] (2), was isolated in very good yield from the reaction of the bis­(dihydrogen) complex [RuH22-H2)2(PCy3)2] (1) with Ph2GeH2. The hydrolytic synthesis of 1,1,3,3-tetraphenyldigermoxane, (HPh2Ge)2O, was catalyzed by 2, 1, and the tricyclopentylphosphine analogue 1Cyp. Coordination of digermoxane by ruthenium led to a complex best formulated as [RuH2({η2-H-GePh2}2O)­(PCy3)2] on the basis of X-ray, NMR, IR, and DFT studies.