Short-step syntheses and complexation properties of Z,Z-tribenzodidehydro- and all-Z-tribenzo[12]annulenes

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• 作者：Siriwan Sirinintasak ; Yoshiyuki Kuwatani ; Shin-ichi Hoshi ; Eigo Isomura ; Tohru Nishinaga ; Masahiko Iyoda
• 关键词：π ; -Conjugated system ; Annulene ; Metal reduction ; Silver complex ; X-ray crystal structure
• 刊名：Tetrahedron Letters
• 出版年：2007
• 期刊代码：109_00404039
• 类别：ch
• 出版时间：7 May 2007
• 卷：48
• 期：19
• 页码：3433-3436
• 文件大小：669 K

摘要

Syntheses of all-Z-tribenzo[12]annulenes (1a–c) and Z,Z-tribenzodidehydro[12]annulenes (2a–c) by the reduction of the corresponding tribenzohexadehydro[12]annulenes 3a–c were carried out using a low valent titanium complex generated from Ti(O-i-Pr)₄ and i-PrMgCl. The unique structure of the first reduction products 2a–c as well as 1a–c was fully characterized. Complexation of these annulenes with silver(I) ions produces the corresponding silver complexes. Among them, the silver complexes of 2a–c exhibit interesting monomer–dimer equilibrium.