A catalyst consisting of titanium oxide encapsulated cuprous iodide nanoparticles was prepared via a sol–gel method using inexpensive raw materials and was harnessed successfully in the oxidative amidation of alkynes via an environmentally benign and sustainable protocol. The mechanism of action of this transformation was thoroughly discussed. The robustness of the catalyst was elucidated by the synthesis of diverse analogues of α-ketoarylamide from a variety of electron rich and poor substrates via a simple procedure in moderate to high yields, with no generation of toxic by-products, in good recyclability up to five cycles, under solvent free and aerobic conditions. The chemical nature, morphology and loading of the CuI@TiO₂ nanocatalyst were investigated by TEM, SEM, XPS, EDX, powder XRD, BET, TGA and ICP-MS.

中文翻译：

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氧化钛包覆的碘化亚铜纳米粒子（CuI @ TiO ₂）对炔烃的好氧氧化酰胺化。

通过溶胶-凝胶法，使用廉价的原料制备了由氧化钛包裹的碘化亚铜纳米颗粒组成的催化剂，并通过对环境有益的，可持续的方案成功地将其用于炔烃的氧化酰胺化。彻底讨论了这种转变的作用机理。通过简单的方法，以中等到高收率，从多种富电子和不良底物合成各种α-酮基芳基酰胺的类似物，阐明了催化剂的坚固性，直至产生良好的可回收性。在无溶剂和有氧条件下进行五个循环。CuI @ TiO ₂的化学性质，形貌和负载 通过TEM，SEM，XPS，EDX，粉末XRD，BET，TGA和ICP-MS对纳米催化剂进行了研究。