Amino-Schiff's base di:amino-ketone and aminocarboxylic acid salt - prepd. by heating omega-lactam or deriv. with water and carbonate, aminocarboxylic acid

摘要

An amino-Schiff's base, of formula (I), and/or a diaminoketone (II) having formula NH2(CH2)n-CO-(CH2)n-NH2 (where n is integer 3-11), is/are prepd. from a raw material consisting of 4-12C omega-lactams, their oligomers, their ring-opened polymers and/or corresp. omega-aminocarboxylic acids. Process comprises (a) heating the raw material with water and a carbonate of Li, Ca and/or Ba in a reactor heated to 60-350 deg.C, removing CO2 generated and recovering a metal salt, (III), of an omega-aminocarboxylic acid. (b) (III) is heated to 250-550 deg.C and converted to (I) and/or (II). A carbonate of Li, Ca and/or Ba is also generated. (c) The metal carbonate formed in (b) is returned to step (a), for further use. Provision of salt-forming step (a) forms a use for the by-prod. formed in (b). Water addn. in (a) prevents cyclisation.