A Ruthenium Dihydrogen Germylene Complex and the Catalytic
Synthesis of Digermoxane
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Abstract
A germylene complex with a labile
η<sup>2</sup>-H<sub>2</sub> coligand, [RuH<sub>2</sub>(GePh<sub>2</sub>)(η<sup>2</sup>-H<sub>2</sub>)(PCy<sub>3</sub>)<sub>2</sub>] (<b>2</b>), was isolated in very good yield from the
reaction of the bis(dihydrogen)
complex [RuH<sub>2</sub>(η<sup>2</sup>-H<sub>2</sub>)<sub>2</sub>(PCy<sub>3</sub>)<sub>2</sub>] (<b>1</b>) with Ph<sub>2</sub>GeH<sub>2</sub>. The hydrolytic synthesis of 1,1,3,3-tetraphenyldigermoxane,
(HPh<sub>2</sub>Ge)<sub>2</sub>O, was catalyzed by <b>2</b>, <b>1</b>, and the tricyclopentylphosphine analogue <b>1</b><sub><b>Cyp</b></sub>. Coordination of digermoxane by ruthenium
led to a complex best formulated as [RuH<sub>2</sub>({η<sup>2</sup>-H-GePh<sub>2</sub>}<sub>2</sub>O)(PCy<sub>3</sub>)<sub>2</sub>] on the basis of X-ray, NMR, IR, and DFT studies
