. . . "When one mol of silicon tetrahalide is reacted with two mols of an organic phosphonate compound then the product is reacted with an excess amount of an organic compound the product produced has the general formula ##STR17## wherein Z is and organic radical with 1-20 carbons or a halide, R' is an organic radicals with 1-20 carbons and R is an organic radical with 1-20 carbons or hydrogen." . .