Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 129, Issue 37, Pages 11362-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja074788y
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The first NMR observation of the long-proposed Cu(III) intermediate in a substitution reaction of methylhalides with organocuprates is presented. One-dimensional H-1 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 trimethylcyano Cu(III) species significantly, whereas in pure substitution reactions the proposed tetraalkyl Cu(III) species seems to be more stable in diethyl ether.
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