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.
Novel cycloimides in the chlorophyll a series
A. F. Mironov, M. A. Grin, S. A. Nochovny and P. V. Toukach, Mendeleev Commun., 2003, 13, 156 DOI: 10.1070/MC2003v013n04ABEH001735
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