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Playhouse NHC: Modulation of the π-acceptor properties of ancillary carbene ligands allows great control over competing pathways in gold(I)-catalyzed reactions. High selectivity can be achieved for the transformation of allenenes within a series of structurally similar but electronically different N-heterocyclic carbenes (NHCs). The experimental results are supported by DFT calculations.
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Klahn et al. (2011) studied this question.
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