[2,3] - Wittig Sigmatropic Rearrangement Involving Titanium and Tin "Ester Enolates" Generated via Transmetalation

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Abstract
Treatment of the silyl ketene acetal of α-allyloxy esters with titanium(IV) chloride, tin(IV) chloride and tin(II) trifluoromethanesulfonate was found to induce exclusively the [2,3]-sigmatropic shift with high erythro-selectivity to give 2-hydroxy-4-alkenoic esters.

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