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DOI: 10.1055/sos-SD-023-00535

Tidwell, T. T.Science of Synthesis, (200623575.

Aryl ester enolates can undergo elimination of aryloxy groups to form ketenes that can be captured by other reagents.[‌55‌‌57‌] The chiral hydroxybinaphthyl ester enolates 34, generated in situ by asymmetric conjugate addition to the corresponding cinnamate esters 33, undergo a spontaneous loss of the hydroxybinaphthyloxy group to form the ketenes 35, which can be trapped by lithium dialkylcuprates to give the chiral ketones 36 in 7391% yields (Scheme 10).[‌56‌] An analogous procedure for a dialkylketene is described in Section

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