Process for preparing amino schiff base or corresponding diamino ketone

摘要

An omega -lactam having 4-12 carbon atoms, an oligomer thereof or a ring-opened polymer or an omega -amino carboxylic acid corresponding thereto, is heated in the presence of water and a metallic carbonate compound to obtain a metallic salt of omega -amino carboxylic acid. Barium, calcium and lithium are the preferred metals. The resulting metal salt is converted to an amino Schiff base which may be used as a starting material for preparing an alpha , omega -diamino alkane which may or may not include an amino group as a side chain. This further produces a metallic carbonate compound. The metallic carbonate is returned and used again as a reagent for forming the metal salt of the omega -amino carboxylic acid to create a closed system.