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Structure Identification of Precatalytic Phosphoramidite Complexes in Solution

Zhang, H. ; Gschwind, R. M.


1+1 is more than 2: A binuclear copper phosphoramidite precatalyst with mixed trigonal/tetrahedral coordination environments (see picture) is proposed based on NMR spectroscopy, mass spectrometry, and elemental analysis. The precatalyst represents a new structural motif for stereoselective copper catalysts and explains ligand acceleration and salt sensitivity in highly enantioselective 1,4-additions to enones.

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