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Paper | Special issue | Vol 54, No. 2, 2001, pp.887-900
Published online, 1st January, 1970
DOI: 10.3987/COM-00-S(I)88
Synthesis of Indeno[1,2-b]phenanthrene-Type Heterocycles by Cyclo- aromatization of Acyclic Non-conjugated Benzotetraynes

Kazuhiro Miyawaki, Fukuko Ueno, and Ikuo Ueda*

*The Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan


A novel and simple procedure for the preparation of 6-oxa-, 6-thia-, and 6-azaindeno[1,2-b]phenanthrenes (4) by thermal cycloaromatization of acyclic non-conjugated benzotetraynes (3) is described.