Organic phosphosilicon compounds of stereocyclic structure

1. The condensation of alkyltriethoxysilanes and dialkyltetraexthoxysiloxanes with methylphosphinic and phenylboric acids has been studied. With methylphosphinic acid the reaction proceeds with the formation of organic phosphosilicon compounds of a stereocyclic structure in a yield depending on the size of the radical attached to silicon. 2. The reaction mechanism and the structure of the reaction products have been proposed. 3. In the case of phenylboric acid, the reaction results in an exchange of functional groups and no organic borosilicon compounds are formed.