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À propos de : Two-Carbon Homologation of Aldehydes via Silyl Ketene Acetals.2. Study of the Stereochemical Control in the Formation of(E)-Alkenoic Acids        

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  • Two-Carbon Homologation of Aldehydes via Silyl Ketene Acetals.2. Study of the Stereochemical Control in the Formation of(E)-Alkenoic Acids
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  • The condensation of C,O,O-tris(trimethylsilyl)ketene acetal 1 with aldehydes 2 in the presence ofcatalytic amounts of mercuric iodide at room temperature affords syn and antiβ-trimethylsiloxyα-trimethylsilyl alkanoic acid silyl esters 3 in good yields. These new compounds gave, under acidicor basic conditions, E and (or) Z enoic acids 4. The paths for the formation of these alkenoic acidsare discussed.
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