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Obituary
Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
January 13, 2023
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Communication | Regular issue | Vol 20, No. 4, 1983, pp.551-556
Published online, 1st January, 1970■ Competitive Formation of Pyrrole and Pyridazine Ring: Stable Tetrahydropyridazine Carbinolamine as Common Precursor
Published online, 1st January, 1970
DOI: 10.3987/R-1983-04-0551
■ Competitive Formation of Pyrrole and Pyridazine Ring: Stable Tetrahydropyridazine Carbinolamine as Common Precursor
Leopoldo Ceraulo, Liliana Lamartina, Onofrio Migliara, Salvatore Petruso, and Vincenzo Spiro
*Instituto di Chimica Farmaceutica e Tossicologica, Università digli Studi di Palermo, Via Archirafi 32, 90123 Palermo, Italy
Abstract
It is demonstrated, by 13C-nmr analysis, that the precursors of both imidazo[1,5-b]pyridazines 3a-c and 1-ureidopyrroles 4d-f have the tetrahydropyridazine structure 2a-f, rather than the previously reported semicarbazone one 1a-f.
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