Online article for Non-subscribers

Pay per view

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact:

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

Report | Regular issue | Vol 16, No. 5, 1981, pp.771-774
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


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.