Studies on Regioselectivity of Nitration of Coumarins with Cerium(IV) Ammonium Nitrate: Solid-State Nitration of 6-Hydroxy-Coumarins on Montmorillonite K-10 Clay Support Under Microwave Irradiation
作者： Nemai C. Ganguly , Mrityunjoy Datta , Prithwiraj De , Romaprosad Chakravarty
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摘要: 6-Hydroxycoumarins and their O-methyl ethers were selectively nitrated in the carbocyclic ring even presence of activating 4-Me group 2-pyrone with cerium(IV) ammonium nitrate (CAN) acetic acid acetonitrile acceptable-to-excellent yields. Acetonitrile was found to be a better solvent for regioselective nitration than acid. Use CAN on montmorillonite K-10 clay under microwave irradiation expeditious solvent-free has been revealed first time.
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