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An economical and efficient green chemical method is developed for the synthesis of multi-functionalized benzene derivatives through a natural biopolymer Cellulose Sulfuric Acid (CSA) as a heterogeneous catalytic sequence of Knoevenagal/Michael/Cyclization under solvent-free conditions at 70oC. The metal-free catalytic system under solvent-free condition processes the reactions with a good efficiency. This protocol should be amenable advantages such as simple workup and recoverability of the biopolymer catalyst and reusing several times without significant decrease in catalytic activity.

Solvent and bio-degradable catalyst for the construction of fully-substituted benzenes