In this case, Q is (wherein, R4 is a linear or branched alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 10 carbon atoms or a trimethylsilyl group, R5 is a linear or branched alkylene group having 1 to 5 carbon atoms, an alkenylene group having 2 to 5 carbon atoms or an arylene group having 6 to 10 carbon atoms, and W is chlorine, bromine or iodine).