Abstract

Silver nanoparticles were synthesized in green route with non-hazardous polyvinyl alcohol and polyvinylpyrrolidone as stabilizing as well as reducing agents and water as green solvent. This silver nanoparticle-embedded polymer composite film, Ag/PVA–PVP was characterized by UV–Vis spectroscopy, SEM and TEM. The catalytic activity of this film was evaluated in reduction of p-nitrophenol, acylation of aniline and synthesis of a β-enaminone, 4-phenylamino-pent-3-en-one with appreciably good results. β-enaminone synthesis reaction was chosen to study the effects of kinetic parameters such as reactant quantity, catalyst loading, solvents and temperatures. In a typical reaction, 89% conversion was achieved. A probable chemical reaction mechanism is suggested. Kinetic model fitting for the synthesis of β-enaminone reaction was done for the first time here. Heterogeneous kinetic model following Eley-Rideal pathway showed an excellent data fitting for the reaction. The rate law parameters were estimated.

Graphic abstract

Scheme. Synthesis and catalytic application of multilayer polymer-immobilised nanosilver in condensation reaction of aniline and acetylacetone.

中文翻译：

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固定化多层聚合物纳米银的催化研究苯胺与乙酰丙酮的缩合反应

摘要

以绿色路线合成了银纳米颗粒，其中以无害聚乙烯醇和聚乙烯吡咯烷酮为稳定剂，还使用还原剂和水作为绿色溶剂。这种银纳米粒子包埋的聚合物复合膜Ag / PVA-PVP通过紫外可见光谱，SEM和TEM表征。评价了该膜的催化活性，包括对硝基苯酚的还原，苯胺的酰化和β-烯胺酮，4-苯基氨基-戊-3-烯酮的合成，均具有良好的结果。选择β-烯胺酮合成反应来研究动力学参数的影响，例如反应物数量，催化剂负载量，溶剂和温度。在典型的反应中，达到89％的转化率。建议了可能的化学反应机理。此处首次完成了合成β-烯胺反应的动力学模型。遵循Eley-Rideal途径的异质动力学模型显示了该反应的出色数据拟合。估计了速率法参数。

图形摘要

方案。苯胺与乙酰丙酮缩合反应中固定有多层聚合物的纳米银的合成及催化应用。