Beschreibung:
<jats:p><jats:bold>Ozonolyses of α‐Oxo‐alkenes: On the Existence of α‐Oxo‐ozonides</jats:bold></jats:p><jats:p>Ozonolyses of nine acyclic (<jats:bold>1a</jats:bold>–<jats:bold>i</jats:bold>) and of two cyclic (<jats:bold>14, 29</jats:bold>) α‐Oxo‐alkenes on polyethylene or in pentane afforded in eight cases (<jats:bold>1d</jats:bold>–<jats:bold>i, 14, 29</jats:bold>) isolable α‐Oxo‐ozonides. α‐Diozonides (<jats:bold>9</jats:bold>) are obtained from five of the acyclic α‐Oxo‐alkenes (<jats:bold>1a, b, d, g, h</jats:bold>). All isolated ozonides are labile; the 2,4‐dinitrophenylhydrazones of the α‐Oxo‐ozonides, however, are very stable. Decomposition of the α‐Oxo‐ozonides affords not only the hitherto known fragments, but non‐peroxidic isomers (<jats:bold>8</jats:bold>) of the ozonides, too.</jats:p>