A technique of "Grindstone chemistry" is applied to the solvent-free halogenation of arenes with NaCl, NaBr or I 2 using (diacetoxyiodo)benzene as the oxidant. Improved yields and higher purities of the products are observed compared with those from established methods.

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Graphene oxide catalyst, obtained by table sugar carbonization, is envisaged for the synthesis of bio-active benzylpyrazolyl coumarin derivatives with considerable yield and remarkable re-usability.