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(a) Click reactions with azido-P3HT (17) in the Cu-catalyzed (18) and strain-promoted Cu-free (19) conditions. (b) Comparison of IR of 17 (black), 18 (red), and 19 (blue). 17 was prepared by quenching with HCl and resulted in a strong azide peak at 2105 cm–1. Quenching with AcOH produced similar results. In both 18 and 19, complete disappearance of the azide peak was observed.
