Synthesis of symmetric anhydrides using visible light-mediated photoredox catalysis
2012
A new approach to anhydride formation is reported via activation of C–O bonds by the Vilsmeier–Haack reagent formed by Ru(bpy)3Cl2 and CBr4 in DMF. Various aryl and alkyl carboxylic acids are converted to the corresponding anhydrides in excellent yields.
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