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Conclusions A radical chain mechanism was proposed for the reaction of triethylgermane with dialkylmercury compounds.

A method was developed for obtaining the O-silylated acetals of ketenes and the esters of a-germylated carboxylic acids, which is based on the reaction of the esters of a-bromocarboxylic acids with bis(triethylsilyl)- and bis(triethylgermyl)mercury.

A new method has been developed for the synthesis of substituted bis(silylmethyl)mercury compounds and benzoylgermanes based on the reaction of bis(triethylgermyl)mercury with the corresponding chloromethylsilanes and benzoyl chloride in the presence of atmospheric oxygen.

A general method was developed for the synthesis of bis(silylmethyl)mercury compounds, which is based on the photoinitiated chain free-radical reaction of bis(triethylsilyl)- and bis(triethylgermyl)mercury with chloromethylsilanes.

On the basis of the NMR spectral data on1H,29Si, and199Hg nuclei, it was shown that Hg-X coordination interaction is possible for the compounds (Me3-nXnSiCH2)2Hg, which is manifested to a greater degree for the chloro derivatives.

Conclusions A new method was developed for the synthesis of trialkyl(triorganylsilylalkylthio)silanes and trialkyl(triorganylsilylalkylthio)germanes with the general formula R3MS(CH2)nSiR3 ' (M=Si or Ge) by the reaction of the corresponding triorganylsilylalkenethiols with bis(trialkylsilyl)mercury or bis(trialkylgermyl)mercury.

The photolysis of an equimolar mixture of bis(triethylgermyl)mercury with the benzoyl, m-toluyl, and p-fluorobenzoyl chlorides proceeds to give Hg metal and the corresponding acyltriethylgermanes. In the case of the pivalyl and phenylacetyl chlorides, together with the formation of Hg and Et3GeCl, are generated the acyl radicals Me3CCO and PhCH2CO, and the products of their subsequent transformations are obtained.