SCHEDULED MAINTENANCE
Naturally occurring 4-hydroxy-2-vinylbut-2-en-4-olide (V), an allenic analogue [4-hydroxy-3,3-dimethyl-2-vinylidenebutan-4-olide (VII)], and the corresponding aldehyde ester [ethyl 2-(1-formyl-1-methylethyl)buta-2,3-dienoate (VIII)] have been synthesised by a Claisen-type sigmatropic rearrangement of 3-carboxyprop-2-ynyl vinyl ethers.
D. K. Black, Z. T. Fomum, P. D. Landor and S. R. Landor, J. Chem. Soc., Perkin Trans. 1, 1973, 1349 DOI: 10.1039/P19730001349
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