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Communication | Special issue | Vol 37, No. 1, 1994, pp.249-255
Published online, 1st January, 1970
DOI: 10.3987/COM-93-S48
Heteroaromaticity. 9. The Role of Zwitterions in the Tautomerism of Hydroxy- and Mercaptoheterocycles

Clive W. Bird*

*Department of Chemistry, King’ s College London, The Strand, London WC2R 2LS, U.K.


The application of the Aromaticity Index, IA, shows that the zwitterions derived from a variety of hydroxy or mercaptoheterocycles have comparable aromaticities to their precursors, thus emphasising the potential role of zwitterionic species in tautomeric equilibria.