Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

The ¹³C AND ¹⁵N NMR spectra of 2,3,4-pentanetrione 3-phenylhydrazone, dimethyl 2-phenylhydrazonopropanedioate and ethyl 2-phenylhydrazono-3-oxobutanoate have been measured in deuteriochloroform at 30 °C. The carbon and nitrogen signals have been assigned, and the chemical shifts and coupling constants ¹J(CH) have been determined. Ethyl 2-phenylhydrazono-3-oxobutanoate has been measured first as the (E) isomer and then as a mixture of the (E) and (Z) isomers. This compound has also been prepared with one or two ¹⁵N atoms enabling determination of absolute values of the coupling constants ⁿJ(¹⁵N¹³C) and ¹J(¹⁵N¹⁵N), respectively.