alkyl group, Q is a nitrogen or phosphorus atom, X is a halogen atom, or an --OR.sup.4 group, R.sup.4 is a member selected from H, C.sub.(1-18) alkyl or C.sub.(6-18) aryl, "n" is a whole number from 4 to 6 and "a" is a whole number equal to 0 or 1; and