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Stable unsubstituted 1,2-oxarhodacyclobutanes (2-rhodaoxetanes) are obtained upon oxidation of [RhI(ethene)‘N4’]+ complexes [Eq. (a)]. Similar oxidation of [Rh1(cod)‘N3’]+ oxarhodacyclobutane intermediate (cod = (Z,Z))-1,5-cyclooctadiene; ‘N4’ and ‘N3’ = tetra- and tridentate ligands. The mechanistically interesting formation of these oxarhodacyclobutanes gives insight into the catalytic oxidation of olefins with late transition metal complexes.
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Bruin et al. (1997) studied this question.
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