Methyl Salicylate → 2-Hydroxybenzoic acid 2-(2-hydroxybenzoyl)hydrazide

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반응 단계

0.5 kg (10 mol) hydrazine hydrate was heated with 3.040 kg (20 mol) salicylic acid methyl ester and 2.714 kg vaseline in a protective gas such as nitrogen or argon in the apparatus according to the invention. The water-methanol mixture produced was continuously distilled-off from the reaction mixture. After about three hours, the reaction temperature had risen to 120° C. and approximately half of the quantity of methanol expected theoretically and the entire amount of water were distilled off (0.5 kg). The hydrazide was present in the vaseline as a crystal product in paste. The heating was continued after 30 g boron trioxide was added and the temperature was kept at 150° C. The remaining methanol (0.320 kg) was distilled off. After about three hours, the reaction was complete as determined by the amount of methanol distilled off.

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