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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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Report | Regular issue | Vol 16, No. 5, 1981, pp.771-774
Published online, 1st January, 1970■ Selective Preparation. 32. Phosphoric Acid Catalyzed Cyclization and De-tert-butylation of 2,2’-Diamino-4,4’-di-tert-butylbiphenyl Affording Carbazole
Published online, 1st January, 1970
DOI: 10.3987/R-1981-05-0771
■ Selective Preparation. 32. Phosphoric Acid Catalyzed Cyclization and De-tert-butylation of 2,2’-Diamino-4,4’-di-tert-butylbiphenyl Affording Carbazole
Masashi Tashiro,* Yasuhisa Fukuda, and Takehiko Yamato
*Research Institute of Industrial Science, Faculty of Engineering, Kyushu University, 6-1, Kasuga-koen, Kasuga 816-8580, Japan
Abstract
Heating of 2,2’-diamino-4,4’-di-tert-butyldiphenyl (5) in 85% H3PO4 afforded carbazole (2). However, use of diethylene glycol as a solvent did not give 2 but 2,7-di-tert-butylcarbazole (7) was formed in 64% yield.
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