DIRECT RING CLOSURE THROUGH THE NITRO GROUP. ISOMER FORMATION IN THE SYNTHESIS OF UNSYMMETRICAL PHENAZINES, AND SOME GENERAL OBSERVATIONS ON THE PHENAZINE SYNTHESES
DIRECT RING CLOSURE THROUGH THE NITRO GROUP. ISOMER FORMATION IN THE SYNTHESIS OF UNSYMMETRICAL PHENAZINES, AND SOME GENERAL OBSERVATIONS ON THE PHENAZINE SYNTHESES