palladium nanoparticles

organic frameworks

organic synthesis

copper catalyzed

efficient removal

Green chemistry

Copper sulfate has been immobilized over chitosan by simply stirring an aqueous suspension of chitosan in water with copper sulfate; the ensuing catalyst has been utilized for the azide–alkyne cycloaddition in aqueous media and it can be recycled and reused many times without losing its activity.

Copper on chitosan: a recyclable heterogeneous catalyst for azide–alkyne cycloaddition reactions in water