Azonia-azulene salts. Part IV. Attempts to convert dihydroindolizines into azonia-azulenes

Abstract

The reduction of indolizine (1) and of some substituted indolizines [(6), (8), (10), and (13)] by dissolving metals gave 5,6- and 5,8-dihydroindolizines and 5,6,7,8-tetrahydroindolizines. Attempts to add carbenes to the 5,6-dihydro-2-phenylindolizines (7) and (9) were unsuccessful.