The copper(I) ethylene complex [But2P(NSiMe3)2-κ2 N]Cu(η2-C2H4) reacts with O2, yielding an uncharged dinuclear copper(III) bis(μ-oxo) species, which has been fully characterized, e.g. by single-crystal X-ray diffraction.
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Straub et al. (2000) studied this question.