Abstract
Les acetals allyliques se transforment en ylures par reactions avec des diazoesters catalysees par l'acetate de rhodium(II) puis donnent des dialcoxy-2,5 alcene-4oates par transposition sigmatrope. Une cyclopropanation et une transposition Stevens concurrencent la transposition sigmatrope dans certains cas; l'influence de la structure du reactif et des conditions de reaction sur cette competition est rapportee
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