以各种表面活性剂为固体碱催化剂合成Mg−Al水滑石的Knoevenagel缩合反应

IF 2.8 4区化学 Q1 CHEMISTRY, ORGANIC

Asian Journal of Organic Chemistry Pub Date : 2025-05-01 DOI:10.1002/ajoc.202500015

Shun Nishimura , Huyen Nam Nguyen , Souta Yuuki , Khoki Ebitani

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引用次数: 0

摘要

在不同类型的表面活性剂的存在下，制备了Mg - Al层双氢氧化物（Mg/Al=3.0），通常被设计为水滑石（HT），以控制共沉淀过程中的生成。在阳离子表面活性剂、阴离子表面活性剂、非离子表面活性剂和两性表面活性剂中，苄基二甲基十四烷基氯化铵（在这里用HT‐a表示）的阳离子表面活性剂在糠醛和丙二酸二乙酯的Knoevenagel缩合反应中充当了高活性的Mg−Al HT，该反应被选为本研究的模型碱催化反应。结果表明，（003）的晶粒尺寸与产物收率呈线性关系。基于FE - SEM观察和N2吸附等温线分析，在苯基二甲基十四烷基氯化铵的存在下，HT晶体的聚集和生长被禁止，提供了更小的尺寸域（二次颗粒）。这些结果与碱催化反应的活性增强有关。

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Synthesis of Mg−Al Hydrotalcites with Various Surfactants as Solid Base Catalyst for the Knoevenagel Condensation Reaction

Mg−Al layer double hydroxide (Mg/Al=3.0), commonly designed as hydrotalcite (HT), has been prepared in the presence of surfactant reagents of various types to control its genesis during co‐precipitation. Among cationic, anionic, noninonic, and amphoteric surfactants, the cationic surfactant of benzyldimethyltetradecylammonium chloride (denoted as HT‐a, here) served a highly‐active Mg−Al HT for the Knoevenagel condensation reaction of furfural and diethyl malonate to diethyl 2‐furfurylidenemalonate, which was selected as a model base‐catalyzed reaction for this study. It was found that crystalline sizes of (003) had a linear relation to the product yield. Based on FE‐SEM observations and N₂ adsorption isotherm analysis, aggregation and growth of HT crystals are expected to be prohibited in the presence of benzyldimethyltetradecylammonium chloride, affording the smaller size domains (secondary particles). These results are associated with enhanced reactivity for the base‐catalyzed reaction.

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来源期刊

Asian Journal of Organic Chemistry CHEMISTRY, ORGANIC-

CiteScore

4.70

自引率

3.70%

发文量

372

期刊介绍： Organic chemistry is the fundamental science that stands at the heart of chemistry, biology, and materials science. Research in these areas is vigorous and truly international, with three major regions making almost equal contributions: America, Europe and Asia. Asia now has its own top international organic chemistry journal—the Asian Journal of Organic Chemistry (AsianJOC) The AsianJOC is designed to be a top-ranked international research journal and publishes primary research as well as critical secondary information from authors across the world. The journal covers organic chemistry in its entirety. Authors and readers come from academia, the chemical industry, and government laboratories.