Heterocyclic Studies. III. A Ring Closure Reaction of Diazoacetylpyrazolines

JA Moore, RW Medeiros

Index: Moore; Medeiros Journal of the American Chemical Society, 1959 , vol. 81, p. 6026

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Citation Number: 19

Abstract

The product obtained by treating the diazoacetylpyrazolines I1 and I11 with warm acetic acid or the intermediate bicyclic ketone VI1 with very dilute mineral acid or alkali is an orange- colored, feebly acidic compound with absorption maxima of, respectively, decreasing intensities at 235, 312 and 403 mp, and infrared absorptions at 3.05 and 6.05 p. These spectra require a rather highly conjugated unsaturated carbonyl system which could not ...