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A new thematic extension method is described for the carbocyclization of α‐C( sp 3 )H bonds of amides with alkynes followed by ketonization of the alkynes that utilizes the inexpensive copper(II) acetoacetonate [Cu(acac) 2 ] as catalyst under an oxygen atmosphere to synthesize quinolinones. It is noteworthy that the oxygen atom of the newly formed carbonyl group is from atmospheric molecular oxygen. magnified image
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Xie et al. (2013) studied this question.
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