N- pyrrole alkylation

Ferraris and Newton [1033] studied a variety of polymers prepared from a-terthienyl and 2,5-di(2-thienyl)pyrrole, n-alkylated at the )3 position of the central ring, to evaluate the effects of the size and position of the substituent and the sequence of substituted and unsubstituted ring units on optical and electrochemical properties of both the monomer and the electrochemically prepared polymer. A superior effective degree of conjugation as compared with the corresponding polymer prepared from the 3-alkylthiophenes was observed. The observed bandgap was slightly smaller than observed with the parent compound. 

---