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IPr: 1,3-Bis(2,6-diisopropylphenyl)imidazol-2-ylidene; SIPr: 1,3-Bis(2,6-diisopropylphenyl)imidazolidin-2-ylidene; IMes: 1,3-Bis(2,4,6- trimethylphenyl)imidazol-2-ylidene; ICy: 1,3-Dicyclohexylimidazol-2-ylidene; For reviews on N-heterocyclic carbenes (NHCs), see: Springer, Heidelberg, doi:10.1007/978-3-540-36930-1
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