In this article, we describe the development of a new method for the photocatalytic synthesis of (E)‐stilbenes by the coupling of alkenyl boronic acids and aryldiazonium salts. In our operatively simple and metal‐free system, visible light is used as an energy source and a “green” mixture of water and ethanol is used as solvent. A mechanistic explanation is presented which is supported by several control experiments. The reaction proceeds via a radical pathway, from both the diazonium salt and boronic acid in the presence of visible light.

中文翻译：

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烯基硼酸与四氟硼酸Arenediazonzonium盐的交叉偶联光催化合成对苯二酚

在本文中，我们描述了通过链烯基硼酸和芳基重氮盐的偶联来光催化合成（E）-斯蒂苯二酚的新方法的开发。在我们操作简单且无金属的系统中，可见光用作能源，水和乙醇的“绿色”混合物用作溶剂。给出了机械解释，并得到了一些控制实验的支持。在可见光存在下，反应通过自由基途径从重氮盐和硼酸中进行。