Formic Acid → HCID 178517978, compound

Participants

Reaction Steps

151 g of 1-phenyl semicarbazide, 135.3 g (2.5 mols) of 85% formic acid (technical) and 25 g (0.25 mol) of concentrated sulfuric acid were stirred for six hours at 95° to 100° C. The viscous mass obtained was diluted with 400 ml of water and cooled. The precipitate consisting of 1-phenyl-1,2,4-triazolone-3 was filtered off and washed neutral with water. Drying at 100° C. and 200 mbar gave 145.5 g=90.3% of the theory, of 1-phenyl-1,2,4-triazolone-3 having a melting point of 285° to 286° C. ##STR2##

Provenance & Evidence