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Title
Japanese:Facile Synthesis of Dibenzotetracenedione Derivatives by Rhodium-Catalyzed [2+2+2] Cycloaddition/Spontaneous Aromatization. 
English:Facile Synthesis of Dibenzotetracenedione Derivatives by Rhodium-Catalyzed [2+2+2] Cycloaddition/Spontaneous Aromatization. 
Author
Japanese: 會田侑正, Yu Shibata, 田中健.  
English: Yukimasa Aida, Yu Shibata, Ken Tanaka.  
Language English 
Journal/Book name
Japanese:Chemistry - An Asian Journal 
English:Chemistry - An Asian Journal 
Volume, Number, Page         pp. Ahead of Print
Published date Dec. 17, 2018 
Publisher
Japanese:Wiley-VCH Verlag GmbH & Co. KGaA 
English:Wiley-VCH Verlag GmbH & Co. KGaA 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1002/asia.201801670
Abstract It has been established that a cationic rhodium(I)/SEGPHOS complex catalyzes the [2+2+2] cycloaddn. of biphenyl-linked 1,7-diynes with 1,4-naphthoquinone and anthracene-1,4-dione. Conveniently, spontaneous aromatization proceeded upon removal of the rhodium complex by passing the reaction mixt. through an alumina column, to give the corresponding dibenzotetracenediones and dibenzopentacenediones, resp., in good yields. The obtained dibenzotetracenedione could be readily transformed into the corresponding dibenzotetracene in good yield. This dibenzotetracene showed blue fluorescence with a good quantum yield, which was significantly higher than those of tetracene, tetrabenzotetracene, and hexabenzotetracene. [on SciFinder(R)]

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