Synthesis of 1,8,9,16-Tetrakis(trimethylsilyl)tetra-cata-tetrabenzoquadrannulene

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• 作者：Bharat Kumar ; Benjamin T. King
• 刊名：The Journal of Organic Chemistry
• 出版年：2012
• 出版时间：December 7, 2012
• 年：2012
• 卷：77
• 期：23
• 页码：10617-10622
• 全文大小：469K
• 年卷期：v.77,no.23(December 7, 2012)
• ISSN：1520-6904

文摘

The synthetic efforts that yielded the first stable [4]circulene, 1,8,9,16-tetrakis(trimethylsilyl)tetra-cata-tetrabenzoquadrannulene (TMS₄-TBQ, 1), are reported. The synthesis and characterization of different intermediates are described. The cyclotrimerization of the key precursor tetraalkyne was explored using Rh(I), Ni(0), and Co(I) catalysts. The ultimate product 1 was isolated only after oxidative demetalation of cobalt complexes.