Synthesis of TBDMS end-functionalized polymers, the model sulfonyl fluorides, and the subsequential SuFEx Click reactions. (a) EDC, DMAP, CH2Cl2, rt; (b) CuBr2, TPMA, ascorbic acid, DMF, 40 °C; (c) CuBr2, TPMA, ascorbic acid, DMF, 60 °C; (d) Et3N, CH2Cl2, rt; (e) Et3N, CH2Cl2, rt, then DBU, DMF, 80 °C; (f) DBU, DMF, 80 °C. Reproduced from ref. 25 with permission from Elsevier, Copyright 2015.