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The bicyclic dilactam of 3,4-diamino-1,6-hexanedioic acid was synthesised via the diamide of muconic acid (2,4-hexadiene-1,6-dioic acid) essentially as outlined by Köhl in Berichte 35, 173 (1903). In a modification of Köhl's procedure, the dimethylester of trans, trans-muconic acid (13.6 g=0.080 mole) was autoclaved for 5 hours at 150° C. with 60 ml 32% aqueous ammonia. The resulting solution on evaporation and cooling yielded 1.40 g of crystalline dilactam.

1. customThe resulting solution on evaporation
2. temperaturecooling