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NMR-Detection of Cu(III) Intermediates in Substitution Reactions of Alkyl Halides with Gilman Cuprates

Gärtner, T. ; Henze, W. ; Gschwind, R. M.


The first NMR observation of the long-proposed Cu(III) intermediate in a substitution reaction of methylhalides with organocuprates is presented. One-dimensional 1H and HMBC spectra give for the first time direct experimental evidence for a square planar coordination of the Cu(III) intermediate in solution. The presence of 4,4-dimethylcyclohexenone increases the detectable amount of the ...


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