Pyrroles annulated with polycyclic aromatic compounds, which are expected to be good precursor molecules for low band gap polymers, are prepared by the reaction of aromatic nitro compounds with ethyl isocyanoacetate and the subsequent deethoxycarbonylation.
N. Ono, H. Hironaga, K. Simizu, K. Ono, K. Kuwano and T. Ogawa, J. Chem. Soc., Chem. Commun., 1994, 1019 DOI: 10.1039/C39940001019
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