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HT-poly(3-hexylthiophenes) (HT-PHT) with H/Br end group composition were prepared via a modified McCullough method using anhydrous ZnCl2 for the transmetalation step. These bromine- terminated HT-PHT can be end group modified at theend through a cross-coupling reaction with thienylzinc compounds bearing a THP-protected hydroxy or STABASE-protected amino groups. After deprotection, HT-PHTs with -OH or -NH2 functional groups at theend were obtained. In addition, HT-PHT with pure H/H end group composition were also modified by treatment with Vilsmeier reagent and functionalized with formaldehyde groups at both the R andchain ends. Reduction of the formaldehyde groups produced the HT-PHT diol. MALDI-TOF is a powerful tool to monitor each step of these end group functionalizations.

End Group Modification of Regioregular Polythiophene through Postpolymerization Functionalization