Design of solid supported carbaborane catalyst with the aim of developing latent reactivity and reuse methods

为了对其进行再利用，我们开发了一种新型的非均相催化剂——固体负载碳氰汞三酸酯。该固体负载催化剂对芳烯丙烯醇环化、n -苯基苯胺烯醇环化、芳基和杂取代的1,3-二烯环异构化、串联碳环化等反应具有显著的催化活性。这些反应的后续处理非常简单，因为催化剂是通过普通滤纸过滤反应混合物来回收的。此外，回收的催化剂被重复使用至少20次，没有明显的活性损失。当回收的催化剂在重复使用过程中活性降低时，可先与2N盐酸反应，再与三酸银反应。

We developed a novel heterogeneous catalyst, solid supported carbaboranylmercuric triflate, with the aim of reutilizing it. This solid supported catalyst showed the remarkable reactivities for aryl allyl alcohol cyclization, cyclization of N-tosylanilinoallylic alcohols, regioselective cycloisomerization of aryl- and hetero-substituted 1,3-dienes, tandem carbocyclization, and etc. The workup of these reactions was very simple, as the catalyst was recovered by filtration of the reaction mixture through ordinary filter paper. Moreover, the recovered catalyst was reused without significant loss of activity at least 20 times. In the case of decreasing the activity of the recovered catalyst through the process of reuse, it could be reactivated via the reaction with 2N hydrochloric acid and then silver triflate.