SYNTHESES AND ACTIVE BEHAVIOR OF NOVEL UV PHOTOINITIATORS

 A series of novel hybrid photoinitiators (YPhCOPhXPhI+PhPF6^-, Y = 4-NO₂, 4-MeO or 3-Cl, X = O, OCH₂, or nothing), which contain multiple aromatic rings (PhCOPhXPh), were prepared by reaction of easily available aryl ketones (YPhCOPhXPh) with iodosobenzene diacetate PhI+OCOCH₃(CH₃CO₂)^-]. The inset of an aromatic ring into p-benzoyldiphenyliodonium hexafluorophophate (PhCOPhI+PhPF6^-) (BDPIH, He-type photoinitiator) between diphenyliodonium and benzoyl is propitious both to the preparation and the photoinitiating activity of ketonic diphenyliodonium photoinitiators. The yield and performance of the novel hybrid photoinitiators are much better than those of the He-type initiator.