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A bifunctional catalysis mechanism for an asymmetric base-free Michael addition reaction mediated by a chiral nickel N-heterocyclic carbene complex has been corroborated by mass spectrometry. In particular, for the first time, all of the intermediates for a proposed catalytic cycle for an asymmetric base-free Michael addition of α-methyl cyano ester and cyclic β-keto ester substrates with various...
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