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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
Editor
May 11, 2023
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Communication | Special issue | Vol 97, No. 2, 2018, pp.696-701
Published online, 3rd April, 2018
Published online, 3rd April, 2018
DOI: 10.3987/COM-18-S(T)46
■ Ruthenium-Catalyzed [2 + 2] Cyclization of 1,7-Allenynes in Ionic Liquid and Catalyst Recycling
Nozomi Saito,* Momoko Koyama, and Yoshihiro Sato
*Faculty of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
Abstract
Ruthenium-catalyzed [2 + 2] cyclization of 1,7-allenynes in ionic liquid ([BDMI]PF6) as a reaction medium proceeded to give the corresponding bicyclo[4.2.0]octa-1(8),5-diene derivative in high yield. Furthermore, the recovered catalyst immobilized in the ionic liquid could be recycled up to 10 times.
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