Syntheses and structures of novel m-xylylene-bridged calix[6]arenes: stabilization of a sulfenic acid in the cavity of calix[6]arene
作者:Toshiyuki Saiki、Kei Goto、Norihiro Tokitoh、Midori Goto、Renji Okazaki
DOI:10.1016/s0022-328x(00)00322-3
日期:2000.10
found to be directed into the cavity and surrounded by the calix[6]arene macrocycle with the 1,2,3-alternate conformation, being protected from self-condensation leading to the corresponding thiosulfinate. The high stability of 1h demonstrates that the framework of the bridged calix[6]arene can effectively regulate the reactivity of the functional group fixed in the cavity.
描述了新型的杯状杯[6]芳烃1的合成和结构,该芳烃在腔中具有向内定向的官能团,以及双环骨架在亚磺酸稳定化中的应用。已经发现,不同于它们的前体2,四甲氧基化合物1具有至少在结晶状态下具有1,2,3-交替构型的趋势,除非当中心官能度具有大的空间需求时。1g的亚砜在80°C的甲苯中热解得到稳定的亚磺酸1h几乎是定量的;通过X射线分析确定结构。发现SOH基团被引导进入空腔并被具有1,2,3-交替构象的杯[6]芳烃大环包围,被保护免受自缩合导致相应的硫代亚磺酸盐。1h的高稳定性表明,桥接杯[6]芳烃的骨架可以有效调节固定在腔中的官能团的反应性。