The stable carbene 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene has a pKa of 24 in (CD3)2SO and gives an elimination:substitution ratio with 2-bromopropane comparable to that of 1,5-diazabicyclo[4.3.0]non-5-ene (DBN).
R. W. Alder, P. R. Allen and S. J. Williams, J. Chem. Soc., Chem. Commun., 1995, 1267 DOI: 10.1039/C39950001267
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