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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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Communication | Regular issue | Vol 26, No. 9, 1987, pp.2361-2364
Published online, 1st January, 1970■ Competitive Electrocyclic Reaction of o-Quinodimethane: Sequential Electrocyclic-double[3,3]sigmatropic Reactions for the Construction of 4-Alkylideneisochroman-3-ones
Published online, 1st January, 1970
DOI: 10.3987/R-1987-09-2361
■ Competitive Electrocyclic Reaction of o-Quinodimethane: Sequential Electrocyclic-double[3,3]sigmatropic Reactions for the Construction of 4-Alkylideneisochroman-3-ones
Kozo Shishido, Hironori Komatsu, Keiichiro Fukumoto, and Tetsuji Kametani
*Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980-8578, Japan
Abstract
Thermolysis of allyl 1-alkenylbenzocyclobutenyl-1-carboxylate (5a-f) produced a mixture of 4,4-disubstituted isochroman-3-ones (6a-f), dihydronaphthalenes (8a-f), and 4-alkylideneisochroman-3-ones (7a-f) in good yield. The third product (7a-f) was generated via an unprecedented sequential electrocyclic-double[3,3]sigmatropic reactions of Z-o-quinodimethane.
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