SEARCH Articles Figures Tables 2-substituted thiophenes Electrophilic Substitution Reactions of Pyrrole, Furan, and Thiophene Electrophilic Substitution of Compounds Containing Several Thiophene Rings Electrophilic substitution of pyrrole, furan and thiophene Of thiophene Substitution thiophene Thiophenes electrophilic substitutions Thiophenes substitution