Catalytic dehydrocyclization of 3-isopropyl(n-propyl)-2,6-diphenylpyridine and 3-n-propyl-2,4,6-triphenylpyridine

The catalytic dehydrocyclization of 3-isopropyl-2,6-diphenylpyridine proceeds in two directions: conversion to 10-methyl-3-phenyl-4-azaphenanthrene and conversion to 9,9-dimethyl-4-azafluorene. C(9)-Unsubstituted 4-azafluorenes were obtained in the dehydrocyclization of pyridine bases that contain a phenyl group in the α position and an n-propyl group in the β position. © 1984 Plenum Publishing Corporation.