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synthesized by sol–gel technique and used as a catalyst in
the aza-Michael reaction of various aliphatic or aromatic
amines with a variety of structurally diverse a,b-unsatu-
rated cyclic and acyclic compounds. The attractive features
of this protocol are: simple procedure, operable under
solvent-free conditions at room temperature, cost effec-
tiveness, use of recyclable and environmentally benign
catalyst, and in most cases good to excellent yields of the
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