Abstract
In the last decade an explosive development has been observed in the fields of both ionic liquids (ILs) as potential chemically inert solvents with many possible technical applications, and N-heterocyclic carbenes (NHCs) as catalysts with superb performance. Since the cations of many ILs can be deprotonated by strong bases yielding NHCs, this two fields are inherently connected. It has only recently been recognized that some of the commonly used basic anions of the ILs (such as acetate) are able to deprotonate azolium cations. While the resulting NHC could clearly be observed in the vapor phase, in the liquid – where the mutual electrostatic interactions within the ion network stabilize the ion pairs – the neutral NHC cannot be detected by commonly used analytical techniques; however, from these ionic liquids NHCs can be trapped, e.g., by complex formation, or more importantly these ILs can be directly used as catalysts, since the NHC content is sufficiently large for these applications. Apart from imidazole-2-ylidenes, the formation of other highly reactive neutral species (“abnormal carbenes,” 2-alkylideneimidazoles, pyridine-ylidenes or pyridinium-ylides) is feasible in highly basic ionic liquids. The cross-fertilizing overlap between the two fields may provide access to a great advance in both areas, and we give an overview here on the results published so far, and also on the remaining possibilities and challenges in the concept of “carbenes from ionic liquids.”
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Notes
- 1.
- 2.
Related to the basicity it should be noted that the nucleophilicity of the acetate anion in [C2C1Im][OAc] is sufficiently large to esterify alkyl halides directly [102].
- 3.
It should be noted that a 5 % aqueous solution of [C4C1Im][OH] has been produced [143], and has been used for the combinatorial synthesis of other ILs.
- 4.
Abbreviations
- [C2C1Im][CH3SO3]:
-
1-Ethyl-3-methylimidazolium methanesulfonate
- [C2C1Im][OAc]:
-
1-Ethyl-3-methylimidazolium acetate
- [C2C2Im][OAc]:
-
1,3-Diethylimidazolium acetate
- [CnC1Im][OAc]:
-
1-Alkyl-3-methylimidazolium acetate
- [CnC1Im][OH]:
-
1-Alkyl-3-methylimidazolium hydroxide
- [CnCmIm][HCO3]:
-
1,3-Dialkylimidazolium hydrogen carbonate
- DFT:
-
Density functional theory
- DIPP:
-
2,6-Diisopropylphenyl group
- IL:
-
Ionic liquid
- Im-IL:
-
Imidazolium-based ionic liquid
- NHC:
-
N-Heterocyclic carbene
- Tf2N− :
-
Bis(trifluoromethanesulfonyl)imide
- TfO− :
-
Triflate
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Funding from the New Széchenyi Plan TÁMOP-422B10-1-2010-0009 and OTKA K 105417, and financial support for Oldamur Hollóczki by the Alexander von Humboldt-Stiftung is gratefully acknowledged.
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Hollóczki, O., Nyulászi, L. (2013). Carbenes from Ionic Liquids. In: Kirchner, B. (eds) Electronic Effects in Organic Chemistry. Topics in Current Chemistry, vol 351. Springer, Berlin, Heidelberg. https://doi.org/10.1007/128_2012_416
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