Ethylenically unsaturated monomers susceptible to free radical polymerization may be polymerized by contacting the monomers with an initiating compound having the formula: ##STR1## wherein R.sub.1 is a substituted or unsubstituted aryl radical.
具有
乙烯基不饱和基团且容易发生自由基聚合的单体可以通过与具有以下式子的引发化合物接触而聚合: ##STR1## 其中R.sub.1是取代或未取代的芳基基团。