Phenyl(fluoro)chlorodisiloxanes

Cohydrolysis of phenyltrichlorosilane with phenyl(fluoro)dichloro- and phenyl(difluoro)-chlorosilanes and thermolysis of the formed siloxanes leading to the formation of phenyl(difluoro)chlorosilane are studied. The scheme of thermal decomposition of disiloxanes possessing fluorine atoms in the 1,3 positions is suggested. The scheme is based on the intermediate formation of an active four-membered cyclic complex closed by the fluorine bridge between the silicon atoms. In agreement with the scheme, no thermolysis of 1,3-diphenyl-1-fluoro-1,3,3-trichlorodisiloxane is observed under the studied conditions.