The radical anions of compounds containing the thiophen nucleus (I)–(IV) have been produced by reduction with Na–K alloy and their e.s.r. spectra have been investigated. The spin-density distribution has been interpreted in terms of sulphur p and d models.
L. Lunazzi, G. Placucci, M. Tiecco and G. Martelli, J. Chem. Soc. B, 1971, 1820 DOI: 10.1039/J29710001820
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