3,4-alkylenedioxypyrroles: Functionalized derivatives as monomers for new electron-rich conducting and electroactive polymers

New functionalized derivatives of 3,4-ethylenedioxypyrrole (EDOP, 5a) and 3 ,4-(1,3-propylenedioxy)-pyrrole (ProDOP, 5b) as especially electron-rich mo nomers which yield highly electroactive and stable conducting polymers usef ul for a diverse set Of applications have been synthesized. N-Alkylations o f ProDOP were carried out to yield a variety of ProDOP derivatives having a lkyl, sulfonatoalkoxy, glyme, and glyme alcohol pendant chains. Iodization of EDOP and ProDOP via iodo-decarboxylation afforded iodo-functionalized de rivatives useful for subsequent aryl coupling chemistry. N-Protection and f ormylation of EDOP, followed by Knoevenagel condensation of the resultant 2 -formyl-EDOP with aryl acetonitrile derivatives, led to 1-cyano-2-(2-(3,4-e thylenedioxy-pyrryl))-1-(2-thienyl)vinylene (23) (Th-CNV-EDOP) and 1-cyano- 2-(2-(3,4-ethylenedioxypyrryl))-1-(2-(3,4-ethylenedioxythienyl)vinylene (26 ) (EDOT-CNV-EDOP). A 14-crown-4-ether 34 based dioxypyrrole was synthesized with a cavity potentially useful for lithium ion coordination and sensing in the resultant electroactive polymer. C-Alkylated ProDOPs (43a, 43b, and 43c) containing octyl, ethylhexyl, and dioctyl substituents appended to the central methylene of the propylene bridge, were prepared as monomers for p otentially soluble pi -conjugated polymers.