Polyketo-enols and chelates. Part I. The formation and constitution of xanthophanic enol and the xanthyrones

L Crombie, DE Games, MH Knight

Index: Crombie,L. et al. Journal of the Chemical Society [Section] C: Organic, 1967 , p. 757 - 762

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Citation Number: 2

Abstract

A new structure is proposed, on the basis of spectroscopic and chemical evidence, for the yellow compound diethyl xanthophanic enol formed when ethyl sodioacetoacetate and ethyl ethoxymethyleneacetoacetate are heated together. A mechanism of formation is outlined and supported. The new information is used to prepare various compounds of the xanthyrone class and two of these, 3, 3′, 3′, 5-tetra-acetyl-6-propenyl-α-pyrone and 3′ ...