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A series of five-membered N-heterocyclic carbene C,S palladium(II) π-allyl complexes were successfully developed and characterized. Structural analyses of these complexes revealed that the organopalladium chelates adopt a skew-envelope conformation with a trans disposition of the substituents on the metal chelate rings. Utilizing these C,S palladium(II) π-allyl complexes as catalysts, a catalytic system for the allylic amination reaction has been developed. A series of C–N bond formations between amines and unsymmetrically substituted allylic carbonates could be catalyzed efficiently by complex (±)- 9 in a regioselective manner.
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Krishnan et al. (2013) studied this question.
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