Quaternary Ammonium Salts as Useful Cationic Initiators. Specially Enhanced Activity by Cyano Group Situated at o-Position of Pyridine Ring of N-Benzylpyridinium Salts
1-Phenethyl and p-methoxybenzyl o-cyanopyridinium hexafluoroantimonates were synthesized, which showed much higher initiation activity than the corresponding p-cyano derivatives in the cationic polymerization of glycidyl phenyl ether.