The reductive dehalogenation of α-halogenated carbonyl compounds has been performed by exploiting four different melanin polymers in the role of photocatalyst. The reaction smoothly took place under visible light irradiation in the presence of sodium ascorbate as an additive. The melanin obtained from 5,6-dihydroxyindole 2-carboxylic acid offered the best performance, especially in the reduction of brominated substrates.

中文翻译：

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探索黑色素作为还原脱卤光催化剂的反应性

通过利用四种不同的黑色素聚合物在光催化剂的作用下进行α-卤代羰基化合物的还原脱卤。在抗坏血酸钠作为添加剂的存在下，反应在可见光照射下顺利进行。由5,6-二羟基吲哚2-羧酸获得的黑色素具有最好的性能，特别是在溴化底物的还原方面。