Abstract
The tautomerism of a number
of N1- and N1,N2-substituted monotriazolylpyrazolidine-3,5-diones
and their phenyl analogues has been examined by infrared spectroscopy. The
diketo tautomer is the predominant form, both in the solid state and in
chloroform solution. Monosodium salts of 4,4-dialkyl-1-triazolylpyrazolidinediones
show unusual absorption which indicates strong hydrogen bonding in the
compounds; a three-centre hydogen bond is proposed to explain the observed spectra.
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