Polynuclear heterocyclic compounds, synthesis

Using the above synthesis, a wide variety of triarylsulfonium salt photoinitiators can be prepared. In Table 1 are shown some representative triarylsulfonium salt photoinitiators which were prepared during the course of this research. All the compounds in this table are well characterized crystalline compounds with well defined melting points, elemental analyses, ultraviolet, proton, and nmr spectra (T7). The ability of triarylsulfonium salts bearing non-nucleophilic counterions to serve as photoinitiators is completely general and includes all the symmetrical, unsymmetrical, substituted and unsubstituted as well as polynuclear and heterocyclic salts shown in Table 1. 

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