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Obituary
Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
January 13, 2023
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Paper | Regular issue | Vol 81, No. 5, 2010, pp.1157-1168
Published online, 5th March, 2010
Published online, 5th March, 2010
DOI: 10.3987/COM-09-11898
■ Synthesis of Diaza-Analogue of Fluorenone and Spirobifluorene
Guo-Hong Wu, Qian-Cai Liu,* and Jie Tang
*Department of Chemistry, East China Normal University, 3663 Zhongshan RD(N9, Shanghai 200062, China
Abstract
The effective syntheses of diaza-analogue of fluorenone and spirobifluorene with N=N bond has been conducted with the using of ninhydrin and corresponding acetyl derivatives of arenes. Single-crystal X-ray diffraction of 2-(spirobifluoren-2-yl)- 3,4-dizaspirobifluorene (4a) proved the conformation.
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