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首页> 外文期刊>RSC Advances >Cross-linked poly(dimethylaminoethyl acrylamide) coated magnetic nanoparticles: a high loaded, retrievable, and stable basic catalyst for the synthesis of benzopyranes in water
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Cross-linked poly(dimethylaminoethyl acrylamide) coated magnetic nanoparticles: a high loaded, retrievable, and stable basic catalyst for the synthesis of benzopyranes in water

机译：交联的聚（二甲基氨基乙基丙烯酰胺）包覆的磁性纳米粒子：高负载，可回收且稳定的碱性催化剂，用于水中苯并吡喃的合成

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摘要

A novel heterogeneous catalyst has been synthesized based on the distillation-precipitation-polymerization of methyl acrylate onto modified magnetic nanoparticles followed by the amidation of the methyl ester groups using N, N-dimethylethylenediamine. The resulting poly(dimethylaminoethyl acrylamide) coated magnetic nanoparticles (MNP@PDMA) catalyst was characterized using an array of sophisticated analytical techniques, including FT-IR, TGA, SEM, TEM, CHN, vibrating sample magnetometer (VSM), and XRD analysis. The resulting heterogeneous base catalyst allowed the performance of a domino Knoevenagel condensation/Michael addition/cycloaddition reaction toward the synthesis of 4H-benzo[b]pyranes in excellent yields using water as the reaction medium. The multilayered and polymeric identity of the coated material on the surface of the magnetic nanoparticles provides many catalytic units resulting in the high loading level and high stability of the catalyst. Straightforward magnetic separation and recycling of the catalyst for up to 5 runs is possible without any significant loss of efficiency.
机译：基于丙烯酸甲酯的蒸馏-沉淀-聚合到改性的磁性纳米粒子上，然后使用N，N-二甲基乙二胺酰胺化甲酯基，已经合成了新型的非均相催化剂。使用一系列复杂的分析技术，包括FT-IR，TGA，SEM，TEM，CHN，振动样品磁力计（VSM）和XRD分析，对得到的涂覆有聚（二甲氨基乙基丙烯酰胺）的磁性纳米粒子（MNP @ PDMA）催化剂进行了表征。所得的非均相碱催化剂允许使用水作为反应介质，以优异的产率进行多米诺Knoevenagel缩合/ Michael加成/环加成反应，以合成4H-苯并[b]吡喃。磁性纳米颗粒表面上涂层材料的多层和聚合物特性提供了许多催化单元，从而导致催化剂的高负载量和高稳定性。可以进行简单的磁力分离和最多5次循环的催化剂回收，而不会显着降低效率。

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