Patent ID: 7396947

Claim:
A compound of the formula (I) in which B is a bivalent moiety of the formula —(CHR 1 ) n —(R 2 C═CR 3 )—(CHR 4 ) m where R 1 , R 2 , R 3 and R 4 are each independently hydrogen or alkyl, and n and m are each independently zero or an integer from 1 to 8, where, however, the sum of n and m is from 1 to 8, and in which, moreover, G is chlorine or hydrogen and R′ and R″ are each independently aryl or alkyl or in which B is a bivalent moiety of the formula —(CHR 1 ) n —(CR 2 R 3 ) m —(CHR 4 ) o where R 1 , R 2 , R 3 and R 4 are each independently hydrogen or alkyl, and n, m and o are each independently zero or an integer from 1 to 8, where the sum of n, m and o is from 1 to 8, G is chlorine and R′ and R″ are each independently aryl or alkyl.