Visible‐light‐induced heterogeneous photocatalysis for decarboxylative alkynylation has been performed. The using of cheap, metal‐free and recyclable graphitic carbon nitride (g‐C₃N₄) as the photoredox catalyst in the process enables the facile transformation of a variety of carboxylic acids into structurally diverse alkyne‐containing molecular architectures under mild and environmentally‐benign conditions. Notably, the heterogeneous nature of the reaction system allows for the recovery and reuse of the catalyst in multiple runs without loss of reactivity. The photocatalytic reactions could also be performed in a continuous flow fashion and scaled up to gram‐scale. Furthermore, the preparative power of this strategy is further highlighted by its application in the 1, 2‐amido alkynylation of unactivated alkenes.

中文翻译：

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石墨化氮化碳聚合物作为可回收的光氧化还原催化剂，用于羧酸的脱羧炔化反应

可见光诱导的非均相光催化脱羧炔基反应。使用便宜，无金属且可回收的石墨氮化碳（g ‐ C ₃ N ₄）作为该过程中的光氧化还原催化剂，可以在温和和环境友好的条件下将多种羧酸轻松转化为结构多样的含炔分子结构。明显地，反应系统的非均质性质允许催化剂在多次运行中的回收和再利用而不损失反应性。光催化反应也可以以连续流动的方式进行并按比例放大至克级。此外，该策略在未活化烯烃的1，2氨基炔基化中的应用进一步凸显了该策略的制备能力。