The activity of indenylidene derivatives in olefin metathesis catalysts.

From conceptual DFT we reach values for electrophilicity that describe a clear trend from species II that is prone to undergo nucleophilic attack by the entering olefin: the substituted indenylidene catalysts 3 – 6 exhibit lower electrophilicity, especially when bearing the saturated backbone NHC, systems 3 and 5 .

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