PURPOSE: To obtain the subject compounds which are the starting compunds for dyes or drugs, etc., by reacting a 1,2-diamine with a carboxylic acid in the gas phase at a specific temperature in the presence of a fixed bed catalyst of γ-aluminum oxide and/or silicon dioxides.
CONSTITUTION: 2-lmidazolines of formula III or IV are obtained by reacting a 1,2-diamine of formula I (R2 is H, alkyl) with a carboxylic acid of formula II (R1 is alkyl, aralkyl, phenyl) in the gas phase in a mole ratio of 0.8-1.2 of the diamine per mole of the carboxylic acid, at a temperature of 250-400°C, with γ-aluminum oxide and/or silicon dioxide (may be doped with phosphoric acid) catalyst on a fixed bed. The compounds are useful as starting materials of dyes, drugs, and protectors of plants, catalyst of polymerization and amidol condensation.
YURUGEN SHIYUREEDAA
TONI DOTSUKUNAA
HERUBERUTO KURUUKU
