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Obituary
Zenichi Yoshida (1925-2023)
Zenichi Yoshida (1925-2023)
Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
May 11, 2023
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Paper | Regular issue | Vol 78, No. 2, 2009, pp.389-395
Published online, 25th September, 2008■ Chemistry of the Pseudobasic Amino Alcohols. Part 40. Synthesis of Three New Condensed Nitrogen Heterocyclic Systems
Published online, 25th September, 2008
DOI: 10.3987/COM-08-11511
■ Chemistry of the Pseudobasic Amino Alcohols. Part 40. Synthesis of Three New Condensed Nitrogen Heterocyclic Systems
Dezso Korbonits,* Benjamin Podányi, Árpád Illár, Kálmán Simon, Miklós Hanusz, and István Hermecz
*Chinoin Ltd, Tó utca 1-5, H-1045 Budapest, Hungary
Abstract
Replacement of the central oxygen atom of the heptacyclic condensed diisoquinoline 3 by reaction with hydrazine, hydroxylamine or thiourea in a simple method gave three new heterocyclic ring systems involving 1,2,4,5- tetrazine (7), 1,2,4,5-oxatriazine (8) and 1,2,4,6-tetrazepine (9) central rings.
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