aM.V. Lomonosov Academy of Fine Chemical Technology, Moscow, Russia
bN.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
Mendeleev's Communications, 2003, v. 13(4), p.156-158
The reaction of hydrazine hydrate with purpurin 18 was studied. The resulting monohydrazide readily reacts with the second carboxy group on acidification to give a six-membered chlorin p6 N-aminocycloimide with the reduction of the vinyl group to ethyl.