(1,2,5-Trimethyl-4-piperidylidene)-α-naphthylamines in the synthesis of 9-methylnaphtho [1, 2-b ] [1, 6 ]naphthyridine and 2,3-dimethyl-4- azaphenanthrene

9-Methylnaphtho[1,2-b][1,6]naphthyridine and 2,3-dimethyl-4-azaphenanthrene were obtained by the catalytic dehydrocyclization of (1,2,5-trimethyl-4-piperidylidene)-α-naphthylamine. © 1974 Consultants Bureau.