1. Y. Kurasawa, T. Hosaka, A. Takada, H. S. Kim, and Y. Okamoto, J. Heterocyclic Chem., in press.
2. Y. Kurasawa, T. Hosaka, A. Takada, H. S. Kim, and Y. Okamoto, J. Heterocyclic Chem., submitted.
3. A convenient synthesis of 3-formyl-2-oxo-1,2-dihydroquinoxaline chlorophenylhydrazones: Novel tautomeric equilibria between hydrazone imine and diazenyl enamine forms with long-range pSSrototropy
4. The tautomer ratio A/B of compound 2b (m-Cl) in deuteriodimethyl sulfoxide was calculated from the integral curves of the hydrazone NH and N4-H proton signals in reference [3], which did not reflect the accurate tautomer ratio of A to B. The tautomer ratio of A to B in the present investigation was obtained from the integral curves of hydrazone CH, diazenyl CH, C5-H or other CH proton signals, which provided the reliable tautomer ratios in a series of mixed media.
5. P. W. Robertson, T. R. Hitchings, and G. M. Will, J. Chem. Soc., 808 (1950).