. . . . . . . . "G is a leaving group, preferably, a nitro group or a halogen such as fluorine or bromine or chlorine, or G is a vinyl group, or a haloalkyl group such as a chloromethyl or bromomethyl group, or a vinyl sulfone group, each R1 is an electron withdrawing group independently selected from fluorine, trifluoromethyl, nitro, and functional equivalents thereof;" . .