Abstract

In this work, layered zirconium phosphates were synthesized via a reflux method and calcined at different temperatures (200, 400, and 600°C). The catalytic activity of the prepared solids was tested in the condensation of o-phenylenediamine and o-aminothiophenol with various aromatic aldehydes. The reaction conditions were optimized taking into account some parameters that control the reaction, namely the nature and volume of the solvent and the mass of the catalyst. The results showed that solid ZrP-200 (layered zirconium phosphate calcined at 200°C) is the best performing catalyst for this reaction, because it has good catalytic activity and can be reused for at least five cycles with only a slight decrease in catalytic activity. In addition, a possible mechanism for the synthesis of benzimidazoles and benzothiazoles over ZrP-200 was proposed and discussed at the end of this study.

中文翻译：

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层状磷酸锆催化合成苯并咪唑和苯并噻唑衍生物的高效实用方法：煅烧温度的影响

摘要

在这项工作中，通过回流法合成了层状磷酸锆，并在不同温度（200、400 和 600°C）下煅烧。测试了制备的固体在邻苯二胺与邻苯二胺缩合反应中的催化活性。-氨基苯硫酚与各种芳香醛。考虑到一些控制反应的参数，即溶剂的性质和体积以及催化剂的质量，对反应条件进行了优化。结果表明，固体ZrP-200（200℃煅烧的层状磷酸锆）是该反应性能最好的催化剂，因为它具有良好的催化活性，并且可以重复使用至少五个循环，催化活性仅略有下降。此外，在本研究的最后提出并讨论了在 ZrP-200 上合成苯并咪唑和苯并噻唑的可能机制。