Minisci 烷基化可用于通过烷基自由基加成对芳烃进行官能化。当前制备烷基自由基的方法遵循来自各种官能团的氧化或还原途径。开发超越这些传统方法的新战略仍然难以捉摸,但意义重大。在本文中,我们提出了一种氧化还原中性和无催化剂的方案,以在芳烃的三氟甲基化和一般烷基化的背景下产生烷基自由基。该协议通过 Norrish I 型概念产生烷基自由基,适应各种官能团并以良好的产率提供产品。该方法在光的辅助下鉴定了一系列化合物作为三氟甲基化和烷基化试剂。预计这些化合物可以在其他涉及自由基的反应中找到潜在的应用。
RhH(PPh3)4 and 1,2-bis(diphenylphosphino)ethane (dppe) catalyzed the organothio exchange reaction of α-organothioketones and organic disulfides. The reaction was affected by the structure of the substrate: α-phenylthio and α-alkylthio aryl ketones reacted effectively with diaryl and dialkyl disulfides; α-phenylthio dialkyl ketones reacted with diaryl disulfides but not with dialkyl disulfides; diaryl disulfides with electron-donating p-substituents were more reactive than those with electron-withdrawing p-substituents.