Dithio derivatives of aldehydes and ketones have been deprotected under neutral conditions using visible light provided by a 120 Watt spotlight and methylene green as a sensitizer. The key step in the deprotection is apparently an electron transfer from the dithio derivative to the electronically excited visible dye. The resulting dithio radical cation undergoes fragmentation, and the corresponding
醛和酮的二
硫代衍
生物已在中性条件下使用由120瓦聚光灯提供的可见光和亚
甲基绿作为敏化剂进行了脱保护。脱保护的关键步骤显然是电子从二
硫代衍
生物转移到电子激发的可见
染料。所得的二
硫代自由基阳离子发生裂解,并且以优异的产率分离出相应的醛和酮。