
TY  - JOUR
A1  - Woodruff, M 
A1  - Polya, JB 
T1  - Tautomerism of Pyrazolidine-3,5-diones. III. Nuclear magnetic resonance spectra
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1978
VL  - 31
IS  - 8
SP  - 1855
EP  - 1859
KW  - 
UR  - https://doi.org/10.1071/CH9781855 
N2  - The tautomerism of some N1- and N1,N2-substituted pyrazolidine-3,5-diones has been studied by N.M.R. spectroscopy. The diketo form is the only unambiguously detectable tautomer of N-phenylpyrazolidine-3,5-diones in CDCl3 and (CD3)2SO whereas N-(1H-1,2,4-triazol-5-yl)pyrazolidine- 3,5 diones exist as a mixture of the diketo form with other tautomers. Polar solvents shift the equilibrium towards the keto-enol form; the diketo form is favoured at raised temperatures. 
ER  -

