| abstract |
A compound comprises a blocked halogenated hydroxydiphenyl ether of the formula (I), where X1 is a halogen, X2 is chlorine or bromine, X3 is hydrogen, chlorine or bromine, X4 is chlorine, bromine, alkyl having 1 to 3 carbon atoms, -CHO, -CN or -NH2, X5 is chlorine, bromine, methyl, trichloromethyl, -CHO, -CN or -NH2, n is 1 or 2, and R is an ether linkage inhibiting group. |