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31P NMR studies on the formation of [Cu(CCPh)(Xant-phos)]. 31P NMR spectra measured under an N2 atmosphere in CDCl3. (A) [Cu(OAc)(Xantphos)]; (B) [Cu(OAc)(Xantphos)] with 40 equiv of phenylacetylene; (C) [Cu(OAc)(Xantphos)] with 40 equiv of iPr2NH; [Cu(OAc)(Xantphos)] with 40 equiv of both phenylacetylene and iPr2NH under (D) air or (E) N2; (F) [Cu(CCPh)(Xantphos)] formed from salt metathesis from [CuCl(Xantphos)] and lithium phenylacetylide.
