Clean and green: Copper(I) complexes of phenanthroline-based ligands anchored on the chitosan polymer are good catalysts for the “click” cycloaddition of azides with terminal alkynes (see scheme; the scanning electron microscopy image shows the porous structure of the catalyst). These heterogeneous catalytic systems do not require a base or reducing agent and operate in alcohol or water.
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Chtchigrovsky et al. (2009) studied this question.
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