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OSiMe3stable a t room temperature under argon, but highly reactive in air has been isolated and characterized by i.r., n.m.r. and mass spectrometry. d 4 b c A 2 b c /

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crude product gave 2.6 g. of forerun, b.p. up to 238°( 0.005 mm.), followed by 7.3 g. (80%) of colorless liquid, b.p. 250-2510 (0.005 mm.), nwD 1.5750, dlat 1.005. The compound volatilized between 460-470°with no sign of decomposition.

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Procedures for the synthesis of a number of silyl and germyl ketones, by hydrolysis of the related 2-substituted 1,3-dithianes, are given. New ketones described include several trialkylgermyl compounds, acetyltrimethylsilane, and new bisketones.