In this report, two heterogeneous nanocatalysts based on α-zirconium hydrogen phosphate were applied. These heterogeneous catalysts have demonstrated the promising catalytic activity for the synthesis of 2-substituted benzimidazoles in two different methods. One of these reactions is the functionalization of the C–H bond and the formation of C–N bond, and the other reaction involves the condensation reaction between aldehydes and 1,2-phenylenediamine. The activity of both catalysts was compared in two methods, and the superior catalyst was introduced. The prepared catalysts are easily separated from the reaction mixture by centrifugation and reused several times without significant loss of activity.

中文翻译：

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α-磷酸氢锆锆纳米催化剂催化两种方法合成苯并咪唑（CH官能化和缩合反应）

在本报告中，使用了两种基于α-磷酸氢锆的非均相纳米催化剂。这些非均相催化剂已经证明了以两种不同方法合成2-取代的苯并咪唑的有前途的催化活性。这些反应之一是C–H键的官能化和C–N键的形成，另一个反应涉及醛与1,2-苯二胺之间的缩合反应。用两种方法比较了两种催化剂的活性，并引入了高级催化剂。通过离心容易地将制备的催化剂从反应混合物中分离出来并重复使用数次，而没有明显的活性损失。