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Conversion of homoallylic, secondary carbonates 1 (n=1 mmol). Se‐Cat. 1=5 mol %; TAPT=5 mol %. Reaction time=37 h to 41 h, yields without brackets were determined by 1H NMR spectroscopy using 1,1,2,2‐tetrachloroethane as an internal standard. Yields with brackets refer to isolated compounds. Diastereomeric ratios (d. r.) were determined by 1H NMR spectroscopy of crude products. [a] Reaction times longer than 41 h. All products 2 were obtained as E‐isomers.
