Abstract: A systematically regiocontrolled synthesis of poly (3-alkylthiophenes)(P3AT) mediated by Rieke zinc is reported. Rieke zinc undergoes oxidative addition to 2, 5-dibromo- 3-alkylthiophene or 2-bromo-5-iodo-3-alkylthiophene regioselectively to afford 2-bromo-5- (bromozincio)-3-alkylthiophene (2) or 2-bromo-5-(iodozincio)-3-alkylthiophene
