three axles threaded through a single ring have been prepared through active metal template synthesis. Nickel-catalyzed sp(3)-sp(3) homocouplings of alkyl bromide "half-threads" through 37- and 38-membered 2,2':6',2″-terpyridyl macrocycles generate triply threaded [4]rotaxanes in up to 11% yield. An analogous 39-membered macrocycle produced no rotaxane products under similar conditions. The constitutions
[4]通过活性
金属模板合成制备了具有三个轴穿过单个环的轮烷。
镍催化的 sp(3)-sp(3) 烷基
溴“半线”通过 37 和 38 元 2,2':6',2"-三联
吡啶大环的同偶联产生三重线 [4] 轮烷到 11% 的收率。类似的 39 元大环在类似条件下不产生轮烷产物。[4]轮烷的组成通过核磁共振光谱和质谱测定。双螺纹 [3] 轮烷也从反应中获得,但没有分离出 [2] 轮烷,这表明在脱
金属后,单螺纹轮烷的轴可以滑过一个大环,该大环足够容纳三个螺纹。