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A number of bis(sily1)-and bis(germy1)-ketones have been prepared by the oxidation of the corresponding carbinol or by the hydrolysis of the dithiane precursor. The ketones are all highly colored and their spectral properties are consistent with inductive interaction of both metalloid atoms with the carbonyl group. The reactions of bis(tripheny1germyl)ketone under various conditions have been studied and the results obtained are consistent with the intermediacy of triphenylgermyl radicals.Canadian Journal of Chemistry, 46, 2119 (1968) Research (1-6) in these laboratories over a number of years has resulted in the preparation of a large number of acylsilanes and acylgermanes.' The most striking features of these compounds are their remarkable spectral properties, both in the infrared and ultraviolet regions. Thus thecarbonyl n -t z* transitions of the acyl-silanes and -germanes show a marked bathochromic shift compared with those of their carbon counterparts, and the infrared carbonyl stretching wavelength in the metalloidal compounds is also significantly longer than in the analogous carbon compounds. In addition it has recently been shown (7, 8) that acylsilanes undergo unusual photochemical transformations.In view of the above results, it appeared of interest to synthesize compounds where the carbonyl group was flanked by two metalloid atoms, in order to gain further insight into the effect of adjacent metalloid atoms on the chemical and spectral properties of the carbonyl group. A preliminary account of the preparation and spectral properties of bis(triphenylsilyl)ketone, 1, and its germanium analog 2, has appeared (9) and in the present communication we wish to give full details of this work, together with an account of the synthesis and spectral properties of additional ketones, and a study of the chemical reactions of bis(triphenylgermyl)ketone, 2. 'We now favor usage of the term acylsilane instead of the formerly used a-silyl ketone to describe compounds with the structure Si-CO-. Preparation of Bis(metalloidal)ketonesBis(triphenylgermyl)ketone, 2, was prepared by the route shown in Fig. 1

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