A simple method to prepare head-to-tail coupled, regioregular poly(3-alkylthiophenes) using grignard metathesis

Poly(3-alkylthiophenes) (PATs) exhibit promising electronic properties; how ever, their regioregular syntheses are only beginning to be developed. The authors describe a new method for the preparation of head-to-tail coupled ( HT) PATs, in which methylmagnesium bromide is utilized to effect a Grignard metathesis that displays unexpectedly high regioselectivity. The method pr oduces regioregular HT-PATs quickly, economically and in high yields, which lends it excellent potential for industry-level production.