The literature n.m.r. assignment for 4-cinnolones is revised. The spectra of substituted 4-cinnolones are used to confirm the gross structures of 4-cinnolones and to investigate the tautomerism of some sulphonic acid derivatives. The effect of substituents on chemical shifts and coupling constants in the cinnolone series is discussed.
A. R. Katritzky, E. Lunt, B. Ternai and G. J. T. Tiddy, J. Chem. Soc. B, 1967, 1243 DOI: 10.1039/J29670001243
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