RhI catalysed rearrangements of vinyl epoxides to ccp-unsaturated aldehydes and cleavage of oxetans to olefins and aldehydes are described and the reactions interpreted in terms of RhI acting as a weak Lewis acid. RECENTLY, we described some rearrangements of cycloolefinic epoxides in the presence of [Rh(CO),Cl],. Some
Aus den Ketonen (II) erhält man nach Wittig die Olefine (I); die Ketone (II) entstehen bei der Diels‐Alder‐Reaktion von Dienen (III) mit Vinylketonen (IV).
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