Scheme 22.
Synthesis of pyridinium-based monomers, 28–31. Conditions: a = morpholine, NEt3, THF, RT, 48 h; b = N-methylpiperazine, NEt3, THF, RT, 48 h; c = dimethylamine, EtOH, 0 °C, 10 min; d = phenol, K2CO3, DMF, RT, 2 h.
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