Process for producing substituted or unsubstituted 2-phenyl-1.2.3.-triazole-4-carboxaldehyde

摘要

2-Phenyl-1.2.3-triazole-4-carboxaldehydes having the formula: <IMAGE> are obtained by oxidizing a 2-phenylglycosotriazole having the formula: <IMAGE> wherein R is hydrogen, halogen, methyl, carboxyl, a sulfonic acid group or the alkali metal salt thereof, n is 2 or 3, R' is hydroxymethyl when n is 2 and is hydroxymethyl or methyl when n is 3, with an oxide of manganese such as manganese dioxide or manganese oxide in dilute sulfuric acid of 20 to 80 wt. % concentration at a temperature of 0 DEG to 80 DEG C. The oxidation reaction is carried out in a dispersed state for from 2 to 100 hours and the resultant aldehyde is separated from the reaction mixture by extraction with an organic solvent. The purity of the aldehyde thus obtained is higher than 85 wt. % and the yield is 40% to quantitative on the basis of 2-phenylglycosotriazole. The aldehyde can be further purified by convenient means.