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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
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May 11, 2023
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Communication | Special issue | Vol 50, No. 2, 1999, pp.641-644
Published online, 1st January, 1970■ Reactivity of Zinc(II) 5-Oxonia-protoporphyrin-IX: Synthesis of the First 5-Oxonia-15-phlorin
Published online, 1st January, 1970
DOI: 10.3987/COM-98-S(H)44
■ Reactivity of Zinc(II) 5-Oxonia-protoporphyrin-IX: Synthesis of the First 5-Oxonia-15-phlorin
Todd E. Clement, Benjamin Gerlach, Mathias O. Senge, and Kevin M. Smith*
*Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616-5295, U.S.A.
Abstract
The reactivity of zinc(II) 5-oxoniaprotoporphyrin-IX with selected carbon nucleophiles is demonstrated to be highest at the 15-Cmeso position, enabling the first synthesis of a 5-oxonia-15-phlorin which has been isolated and studied by X-Ray crystallpgraphy.
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