| 摘要 |
<p>Photoinitiators are produced by introducing a halogen into a mixture of a diarylsulphide and a Lewis acid catalyst (preferably ACl3) and from 0.2 to 2 parts by weight of inert solvent (preferably dichloromethane) per part of diarylsulphide followed by an anion exchange reaction with HX, NaX or KX where X is BF4, PF6, SbF5OH, AsF6, or SbF6. The products have the formula III:- <CHEM> in which Ar<1> is a monovalent, and Ar<2> is a divalent, aromatic radical selected from phenyl, naphthyl, anthryl, thienyl, furanyl and pyrryl whch may be substituted by alkyl, substituted alkyl, alkoxy, cyano, acetamido or acyl groups or halogen atoms.</p> |
