General Characteristics of Triarylsulfonium Salts

All four of the triaryl substituted salts of the Group VI elements denoted by structure II have been prepared and characterized. 

Of these, only the triarylsulfonium and triarylselenonium salts have been investigated as photoinitiators for cationic polymerization. Triarylsulfonium salts, in particular, are attractive photoinitiators since they can be readily prepared in high yields by straightforward synthetic techniques. 

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