1989
DOI: 10.1021/ja00196a009
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Quantitative study of the acidity of hydrogen chloride in a molten chloroaluminate system (aluminum chloride/1-ethyl-3-methyl-1H-imidazolium chloride) as a function of HCl pressure and melt composition (51.0-66.4 mol% AlCl3)

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Cited by 70 publications
(23 citation statements)
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“…[8,9] The range of acidities to be reached in IL medium is large, and for example, very acidic H 0 values down to À18 have been determined in acidic haloaluminate ILs. [10][11][12] Brønsted basic ILs are less explored, [13] and we found no Hammett or pH/pK a value measurements in the literature, but undoubtedly, very basic ILs exist. The synthesis of 1-butyl-3-methylimidazolinium hydroxide (BMIM + OH À ) and its very high catalytic activity for Michael reactions has been reported [14] as has CO 2 capture in ILs with, for example, imidazolide or partially fluorinated alkoxide anions.…”
Section: Introductioncontrasting
confidence: 52%
“…[8,9] The range of acidities to be reached in IL medium is large, and for example, very acidic H 0 values down to À18 have been determined in acidic haloaluminate ILs. [10][11][12] Brønsted basic ILs are less explored, [13] and we found no Hammett or pH/pK a value measurements in the literature, but undoubtedly, very basic ILs exist. The synthesis of 1-butyl-3-methylimidazolinium hydroxide (BMIM + OH À ) and its very high catalytic activity for Michael reactions has been reported [14] as has CO 2 capture in ILs with, for example, imidazolide or partially fluorinated alkoxide anions.…”
Section: Introductioncontrasting
confidence: 52%
“…[29,30] A huge range of acidities can be reached in IL media, for example very low H 0 values down to À18 were determined in haloaluminate ILs. [31][32][33] ForB rønsted-basic ILs [34] we found no measurements of the Hammett or pH S /pK a,S values in the literature.H owever, very basic ILs exist. Fore xample, [BMIM]OH is av ery good catalyst for Michael reactions.…”
Section: Ph S Definitions In Ionic Liquidsmentioning
confidence: 70%
“…Accordingly, acidic chloroaluminate ILs contain at least traces of oxy/ hydroxychloroaluminate species and molecular HCl. It has been found already in the late 1980's that Brønsted superacidity results if gaseous HCl is added to acidic chloroaluminate melts and quantitative studies of the acidity of HCl in [C 2 C 1 Im]Cl/AlCl 3 as a function of HCl pressure and IL composition (51.0-66.4 mol% AlCl 3 ) have been published [25]. It is noteworthy that acidic chloroaluminates change their nature under vacuum conditions, since HCl and AlCl 3 may evaporate/sublime from the IL thus changing composition and acidity of the melt.…”
Section: Liquid-ionic Liquid Biphasic Catalysis Usingmentioning
confidence: 99%