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The aerobic copper-catalyzed oxidation of alcohols such as 1 [Eq. (1)] functions even in the absence of oxygen. Non-benzylic and secondary alcohols are further suitable substrates. A key role in this reaction is played by azocarboxylates, which not only serve as complex ligands but also as hydride acceptors; bulky R groups such as tert-butyl are particularly suitable.
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Markó et al. (1997) studied this question.