Synthesis and IR spectra of some derivatives of phenanthridine and 4,9-diazapyrene

A number of acylamino- and diacylaminobiphenyls and the corresponding derivatives of phenanthridine and 4, 9-diazapyrene, including the previously unknown 2,2′-dipropionamidobiphenyl, 5, 10-diethyl-4, 9-diazapyrene, 2, 4-dibenzamidobiphenyl, and 3-benzamido-6-phenylphenanthridine, have been synthesized. The IR spectra of all the compounds have been studied and a group of bands characteristic for the phenanthridine ring in the 1570–1620 cm−1 region and a group of five bands characteristic for the 4, 9-diazapyrene ring in the 1330–1640 cm−1 region have been identified. The nature of the IR spectra of phenanthridine derivatives containing unsubstituted amide groups has also been established.