, and R2 is an alkoxy group with 1 to 8, preferably 1 to 4, carbon atoms, a cycloalkoxy group including 5 to 8 carbon atoms, or a straight or branched chain alkylmercapto group with 1 to 8 carbon atoms,wherein the various R1 and R2 groups can be the same or different, R is a divalent hydrocarbyl group including 1 to 18 carbon atoms, and X is a halogen, to produce a compound of of the formula Q--R-