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The reaction of N‐heterocyclic carbenes, 1a–c, towards cyclopentadienes, 2a–c, was studied. N,N′‐diisopropyl‐substituted carbene 1a acts as a Brønsted base and deprotonates cyclopentadiene, 2a, and isopropylcyclopentadiene, 2b, to yield the corresponding imidazolium cyclopentadienide salts, 3a,b, whereas there is no reaction towards 1,2,3,4,5‐pentamethylcyclopentadiene. Imidazolium cyclopentadienide...
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