Cyclization Dichotomy of Esters of 3-Ureido-2-cyano-2-propenoic and 3-Ureido-2-acyl-2-propenoic Acids

M Ledvina, J Farkaš

Index: Collection of Czechoslovak Chemical Communications, , vol. 59, # 8 p. 1841 - 1852

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Abstract

... Chemical shifts are given in ppm (δ-scale) and coupling constants (J) in Hz. ... formate (15 ml, 90.2 mmol) was refluxed for 6 h. After cooling, the solid reaction mixture was tri- turated with benzene (20 ml), the solid portion was collected on filter ... Hrebabecky H., Beranek J.: Collect. ...

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