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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 32, No. 1, 1991, pp.41-72
Published online, 1st January, 1970■ Synthesis of Angular Benzodipyrazoles and Related Systems
Published online, 1st January, 1970
DOI: 10.3987/COM-90-5594
■ Synthesis of Angular Benzodipyrazoles and Related Systems
Norton P. Peet* and Michael E. LeTourneau
*Merrell Dow Research Institute, 2110 East Galbraith Road, Cincinnati, Ohio 45215, U.S.A.
Abstract
A series of benzo[1,2-c:3,4-c’]dipyrazoles was prepared from cyclohexane-1,3-dione. Several related systems with different central rings were also prepared. In addition, benzo[1,2-c:4,3-c’]dipyrazoles were synthesized from 1,4-cyclohexanedione monoethylene ketal.
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