SYNTHESIS OF 4H-BENZO[hi]PYRROLO[2,1,5-cd]INDOLIZIN-4-ONE. A NOVEL TYPE OF PHENALENONE ANALOG

4H-Benzo[hi]pyrrolo[2,1,5-cd]indolizin-4-one, an analog of phenalenone, is obtained By a one-pot oxidation of 5,6-dihydro-4H-benzo[hi]pyrrolo[2,1,5-cd]indolizine with DDQ in aqueous dioxane. Its characteristic electronic feature is also described, which is different inherently from that of phenalenone or 3H-benz[cd]azulen-3-one.