A green method for the efficient synthesis of 2-amino-3-cyano-4H-chromenes using immobilized piperazine on the surface of graphene oxide (piperazine-GO) as a new heterogeneous bifunctional acid–base catalyst is developed. Click to show full abstract
A green method for the efficient synthesis of 2-amino-3-cyano-4H-chromenes using immobilized piperazine on the surface of graphene oxide (piperazine-GO) as a new heterogeneous bifunctional acid–base catalyst is developed.
               
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