The synthesis of benzannelated annulenes. Dibenzo-tetrakisdehydro-[18]annulene, and tribenzo-bisdehydro[14]annulene.

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概要

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• In order to establish the effect of the annelation of benzene rings on [4<I>n</I>+2] annulenes, the syntheses of benzannelated dehydroannulenes were attempted. Dibenzo-tetrakisdehydro[ 18]annulenes (IIa and IIb) were prepared according to the reaction sequence developed in the synthesis of tetramethyltetrakisdehydro[18]annulene (I) from <I>o</I>-ethynylbenzaldehyde (VIII); both of them proved to be unstable. Tribenzo-bisdehydro[14]annulene (XVII) was also prepared from VIII by a double Wittig reaction, followed by oxidative coupling. An examination of the NMR spectrum indicated that XVII is atropic.

• 公益社団法人 日本化学会の論文

著者

• Ojima Juro

  Faculty of Literature and Science, Toyama University

• Kimura Akihiko

  Faculty of Literature and Science, Toyama University

• Yokomachi Tadayoshi

  Faculty of Literature and Science, Toyama University

関連論文

• The synthesis of benzannelated annulenes. Dibenzo-tetrakisdehydro-[18]annulene, and tribenzo-bisdehydro[14]annulene.

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