Soluble polyaniline and its derivatives doped with dialkylsulfate (DAS : dimethylsulfate, diethyl sulfate, dipropylsulfate etc.) were chemically synthesized. Solubilities of polyaniline doped with DAS (PANI-DAS) powders in polar solvents and polyethoxy aniline doped with DAS (PEtOANI(.)DAS) powders in various alcohols were observed in the range of 3-8 wt.% and 2-5 wt.%, respectively. This improved solubility in organic polar solvents was explained with the interactions between the hydrophilic sulfonate group, polar substituent and polar solvents. Compared to that of HCI doped polyaniline, PANI-DAS showed improved thermal stability upon heat treatment at 160 degreesC. The electrical conductivities of PANI-DAS and PEtOANI(.)DAS films appeared in the range of 1.2 similar to2.3 S/cm. and 10(-2)similar to 10(-4) S/cm, respectively.