X is a halogen (e.g., ???Cl, ???Br, ???I); an alkoxy (???OR2), wherein R2 is a monovalent hydrocarbyl group containing from 1 to about 6 carbon atoms, and optionally includes at least one heteroatom selected from the group consisting of oxygen and fluorine; a hydroxy (???OH); a carboxylate (???OC(???O)R3), wherein R3 is a hydrogen or a monovalent hydrocarbyl group containing 1 to 6 carbon atoms, a