Chiral N-heterocyclic carbene ligands based on [2.2]paracyclophanes form complexes with rhodium. These catalysts can be used in the high-yielding and enantioselective asymmetric conjugate addition of arylboron compounds to cyclic and acyclic enones (see scheme).
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Alexakis A, 2000, EUR J ORG CHEM, V2000, P4011, DOI 10.1002/1099-0690(200012)2000:24<4011::AID-EJOC4011>3.0.CO