ABSTRACT In this work, for the first time, metal hydrogen phosphates and sulfates have been studied as effective solid acid catalysts for the condensation of resorcinol with aromatic and aliphatic aldehydes to give tetrameric cyclic products, resorcinarenes, which have major roles in biological and industrial activities. This catalyst has several advantages, it is non-toxic, thermally and mechanically stable, inexpensive and highly resistant against organic solvents. It increases the reaction rate about six fold and makes this method an attractive alternative to the existing methods for resorcinarene formation. Interestingly, the present catalyst exhibited a high turnover number (TON) and turnover frequency (TOF) which were even comparable with that of HCl. Graphical Abstract

中文翻译：

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使用硫酸氢锌快速合成各种间苯二酚的反应性和环境友好型方案

摘要 在这项工作中，首次研究了金属磷酸氢盐和硫酸氢盐作为有效的固体酸催化剂，用于间苯二酚与芳香族和脂肪族醛缩合生成四聚环状产物间苯二酚，其在生物和工业活动中具有重要作用。 . 这种催化剂有几个优点，它无毒、热和机械稳定、价格便宜且对有机溶剂具有很强的耐受性。它将反应速率提高了大约六倍，并使该方法成为现有的间苯二酚形成方法的有吸引力的替代方法。有趣的是，本催化剂表现出高周转数 (TON) 和周转频率 (TOF)，甚至可与 HCl 相媲美。图形概要