Photoirradiation of triaryl (1-pyrenyl) bismuthonium salts in acetonitrile afforded triarylbismuthanes and pyrene,accompanied by the generation of protic acids. Triaryl (1-pyrenyl) bismuthonium hexafluoroantimonates have proven to behave as efficient photoinitiators for cationic polymerization of oxiranes and a vinyl ether, affording the corresponding polymers in good yields within a minute.
  

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