Condensation products of pyrrole and hexane-2,5-dione

Abstract

Pyrrole and hexane-2,b-dione react in glacial acetic acid containing zinc acetate to give 4,7-dimethylindole, 5,8-dimethylindolizine, 1,4,6,8-tetramethyl-carbazole and a more highly condensed product which has been assigned the structure 1,4-bis(4,7-dimethylindol-2-yl)-1,4,5,8-ethyl-l,2,3,4-tetrahydrocarbazole.