PROCESS FOR THE PREPARATION OF 2-(2,4-DIHYDROXYPHENYL)-4,6-BIS(2,4-DIMETHYLPHENYL)-S-TRIAZINE

摘要

There is described a process for the preparation of 2-(2,4-dihydroxyphenyl)-4,6-bis- (2,4-dimethyphenyl)-s-triazine of the formula I (see fig.I) (I), which comprises a) reacting cyanuric chloride of the formula II (see fig.II) (II) at a temperature of 0 to 110.degree.C in the presence of a Lewis acid in a ratio of 2.3 to 3.0 mol of Lewis acid per mole of cyanuric chloride employed in the presence of at least one inert chlorinated aromatic solvent, with 1,3-xylene of the formula III (see fig.III) (III) in a ratio of 2.1 to 2.5 mol of compound of the formula III per mole of cyanuric chloride employed with addition of compound of the formula III in a period of from 5 to 30 hours to give the compound of the formula IV (see fig.IV) (IV) and then b) without isolating the compound of the formula IV obtained reacting this with resorcinol in a ratio of 0.5 to 1.0 mol of resorcinol per mole of cyanuric chloride employed at a temperature from 0 to 100.degree.C to give the compound of the formula I.