Process for the preparation of 2-(2',4'-dihydroxyphenyl)-4,6-dia

Details Process for the preparation of 2-(2',4'-dihydroxyphenyl)-4,6-dia Process for the preparation of 2-(2',4'-dihydroxyphenyl)-4,6-dia

1992-01-30

1993-01-26

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D25122

Patent

active

051823896

ABSTRACT:
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.degree.-150.degree. 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.

REFERENCES:
patent: 2691018 (1954-10-01), Joyce et al.
patent: 5084570 (1992-01-01), Burdeska et al.
A. Pinner, Chem. Ber. 23, 2919(1890).

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