Methyl (Z)-3-bromo-3-(4-methylbenzenesulfonyl)prop-2-enoate reacted with acetylacetone in THF in the presence of sodium hydride (3 h, 50°C) to give methyl (E)-3-acetyl-2-[(4-methylbenzenesulfonyl)-methylidene]-4-oxopentanoate as the only product. According to the X-ray diffraction data, the crystalline product has enol structure.

Methyl (E)-3-acetyl-2-[(4-methylbenzenesulfonyl)-methylidene]-4-oxopentanoate is a novel product in the synthesis of enol structures.

Paper

Product of the reaction of methyl (Z)-3-bromo-3-(4-methylbenzenesulfonyl) prop-2-enoate with acetylacetone

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