6-[2-Hydroxy-4-(1,2,3-triazol-2-yl)-phenyl]-2,4-dioxo-1,3,5-trimethyl-hexahydro-s-triazines and their preparation

摘要

Triazolylphenyl-triazines of the formula <IMAGE> wherein R1 and R2 denote alkyl or aryl and X1, X2 and X3 denote alkyl, aralkyl or cycloalkyl, which are obtainable by reacting corresponding 3-hydroxyphenyl-triazoles with corresponding 2,4-dihydroxy-triazinium compounds, are outstandingly suitable for the preparation of 4-(1,2,3-triazol-2-yl)-salicylaldehydes, which in turn are starting materials for the preparation of optical brighteners of the type of the triazolylcoumarins.