6153-86-2Relevant articles and documents
Process for the preparation of 2-(2',4'-dihydroxyphenyl)-4,6-diaryl-s-triazines
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, (2008/06/13)
There is disclosed a process for the preparation of 2-(2', 4'-dihydroxyphenyl)-4,6-diaryl-s-triazines of formula STR1 which comprises reacting 2-hydroxy-4,6-diaryl-s-triazines of formula STR2 in the temperature range from 100°-150° C. with thionyl chloride in the presence of a catalytic amount of a polar solvent, and subsequently reacting the chloro-s-triazine intermediate with 1,3-dihydroxybenzene using a Lewis acid in the presence of an inert organic solvent, in which formulae (1) and (2) above the rings A may be further substituted by halogen, hydroxy, lower alkyl, lower alkoxy or lower alkoxycarbonyl. The process of the invention makes it possible to prepare in simple manner and in good yield 2-(2',4'-dihydroxphenyl)-4,6-diaryl-s-triazines which find utility as UV absorbers or as starting materials of the preparation of UV absorbers.