Hercynite silica sulfuric acid: a novel inorganic sulfurous solid acid catalyst for one-pot cascade organic transformations,RSC Advances

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Hercynite silica sulfuric acid: a novel inorganic sulfurous solid acid catalyst for one-pot cascade organic transformations
RSC Advances ( IF 3.9 ) Pub Date : 2022-09-13 , DOI: 10.1039/d2ra03481f
Masoud Mohammadi ₁ , Arash Ghorbani-Choghamarani ₂

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Herein, we delignated the synthesis of a novel inorganic sulfurous magnetic solid acid catalyst by the immobilization of an extremely high content of sulfuric acid functionalities on the amorphous silica-modified hercynite nanomagnetic core–shell via a simple method. Silica sulfuric acid (SSA) modified hercynite nanocomposite (hercynite@SSA) combines excellent recoverability and stability characteristics of hercynite (which can be regarded as a ferro spinel with Fd3m space group and cubic crystal structure) with the strong Brønsted acid properties of –SO₃H groups. This nanomagnetic solid acid was found to be an efficient and facile strong solid acid catalyst for the synthesis of bis(pyrazolyl)methanes via two different one-pot multicomponent methodologies under green conditions. The hercynite@SSA catalyst shows excellent catalytic activity and reusability in the ethanolic medium among different solid acid materials. A plausible reaction mechanism is proposed for this synthesis.

中文翻译：

海西硅硫酸：一种用于一锅级联有机转化的新型无机亚硫酸固体酸催化剂

在此，我们通过简单的方法将极高含量的硫酸官能团固定在无定形二氧化硅改性的海西石纳米磁性核壳上，从而合成了一种新型无机亚硫磁性固体酸催化剂。二氧化硅硫酸 (SSA) 改性的海钙石纳米复合材料 (hercynite@SSA) 结合了海钙石（可被视为具有Fd 3 m空间群和立方晶体结构的铁尖晶石）的出色可回收性和稳定性特性，以及以下强布朗斯台德酸特性： SO ₃ H 基团。发现这种纳米磁性固体酸是一种高效、简便的强固体酸催化剂，可用于合成双（吡唑基）甲烷。绿色条件下的两种不同的一锅多组分方法。hercynite@SSA催化剂在不同固体酸材料的乙醇介质中表现出优异的催化活性和可重复使用性。为这种合成提出了一种合理的反应机制。

更新日期：2022-09-13

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