Scheme 1. Synthesis of acceptor and donor monomers (R = 2-ethylhexyl). (i) Pd2(dba)3, KF, HP(tBu)3BF4, 4-pinacolborane-2-(trifluoromethyl)phenol, THF/H2O; (ii) Pd2(dba)3, XantPhos, TEA, PHOBu2, dioxane; (iii) CuI, PHOBu2, Na2CO3, toluene.
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