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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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Note | Regular issue | Vol 65, No. 12, 2005, pp.3001-3006
Published online, 14th October, 2005■ Regiospecific Aryl Nitration of meso-Tetraarylporphyrins: The Directive Effect of para-Substituent
Published online, 14th October, 2005
DOI: 10.3987/COM-05-10555
■ Regiospecific Aryl Nitration of meso-Tetraarylporphyrins: The Directive Effect of para-Substituent
Hong-Liang Zhang, Wei-Min Shi, and Jian Wu*
*Department of Chemistry, Zhejiang University , Hangzhou, 310027, China
Abstract
Regiospecific nitration of single p-substituted tetraphenylporphyrins with excess nitric acid is reported. The directive effects of different p-substituents, including nitro, acetamido and hydroxy groups, were demonstrated. The electron- withdrawing p-nitro group was found to lead to predominant nitration at the neighboring phenyl ring, and the electron-releasing p-acetamido and p-hydroxy groups lead to adjacent nitration at the same phenyl ring.
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