A concerted six-electron [3,3]-sigmatropic rearrangement of an allyl vinyl ether into an unsaturated carbonyl compound. Suprafacial bond reorganization correlates stereochemistry across the allyl fragment.
An allylic ester is converted to a silyl ketene acetal, which undergoes a [3,3]-sigmatropic rearrangement to an unsaturated carboxylic-acid derivative.
An allylic alcohol reacts with an orthoester under weak-acid catalysis to give a ketene acetal, which rearranges to an unsaturated ester.

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