Synthesis, Structure, and Transannular π−π Interaction of Multilayered [3.3]Metacyclophanes<sup>1</sup>
作者:Masahiko Shibahara、Motonori Watanabe、Tetsuo Iwanaga、Keiko Ideta、Teruo Shinmyozu
DOI:10.1021/jo062220m
日期:2007.4.1
more layered. In the charge-transfer (CT) bands of the multilayered [3.3]MCPs with tetracyanoethylene (TCNE), the λmax gradually shifts to the longer wavelength region, but the extent of the shift is much smaller as the number of layers increases. In the multilayered [3.3]MCP-di- and tetraones, the anti-[3.3]MCP-dione moiety works as an insulator. Therefore, the CT interaction of the four- and five-layered
一系列的三到合成六层[3.3] metacyclophanes([3.3] MCP)的3 - 6已由(被成功地完成的p甲苯磺酰基)甲基异氰化物(TOSMIC)方法作为一个关键偶联反应。他们的重要的合成中间体是两个和三个层状双(溴甲基)化合物11,17,21,和四(溴甲基)化合物25和28。的三至六层[3.3]的MCP(结构3 - 6以及三至六层[3.3] MCP-二- ()22 - 24)和tetraones(26,基于1 H NMR数据和X射线结构分析已经阐明了作为合成中间体的图27和图29)。这些多层的环烷以两种不同的几何结构构成,即syn- [3.3] MCP和反-[3.3] MCP-2,11-二酮。原则上,它们的几何形状在多层[3.3] MCP中保持不变,但是通常观察到顺-[3.3] MCP部分的两个苯环的二面角的变形。在四层MCP 4中,中央的[3.3] MCP部分具有反几何形状。这些数据表明[3