Pyrrole derivatives which were substituted in the 3-position by an acyl and an alkyl, the 3, 4-position by an alkyl ring were synthesized (compounds with a two, six and ten carbons normal chain and a six carbons ring). Their conductivity and solubility were investigated. Electrooxidation in acetonitril/lithiumtetrafluoroborate led to the deposition of brittle black conducting polymer films on the anode. The conductivity decreased with substitution of free positions. These conducting polymers had not solubility.