Nonafluoro-tert-butyl alcohol

Nonafluoro-tert-butyl alcohol (IUPAC name: 1,1,1,3,3,3-hexafluoro-2-(trifluoromethyl)propan-2-ol) is a fluoroalcohol. It is the perfluorinated analog of tert-butyl alcohol. Notably, as a consequence of its electron withdrawing fluorine substituents, it is very acidic for an alcohol, with a pKa value of 5.4, similar to that of a carboxylic acid. As another consequence of being a perfluorinated compound, it is also one of the lowest boiling alcohols, with a boiling point lower than that of methanol. It is prepared by addition of trichloromethyllithium to hexafluoroacetone, followed by halogen exchange with antimony pentafluoride.[1] The aluminate derived from its alkoxide anion, tetrakis[1,1,1,3,3,3-hexafluoro-2-(trifluoromethyl)propan-2-oxy]aluminate(1–), {Al[(CF3)3CO]4}– is used as a weakly coordinating anion.[2]

Nonafluoro-tert-butyl alcohol
Names
IUPAC name
1,1,1,3,3,3-hexafluoro-2-(trifluoromethyl)propan-2-ol
Other names
perfluoro-tert-butyl alcohol, perfluoro-tert-butanol
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.017.417
EC Number
  • 219-157-3
Properties
C4F9OH
Molar mass 236.04 g/mol
Appearance Colorless liquid
Boiling point 45 °C (113 °F; 318 K)
Miscible
Acidity (pKa) 5.4 (in H2O)
Hazards
Main hazards Corrosive, eye irritant
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

See also

References
  1. Filler, Robert; Schure, Ralph M. (1967-04-01). "Highly acidic perhalogenated alcohols. A new synthesis of perfluoro-tert-butyl alcohol". The Journal of Organic Chemistry. 32 (4): 1217–1219. doi:10.1021/jo01279a081. ISSN 0022-3263.
  2. Krossing, Ingo; Raabe, Ines (2004-04-13). "Noncoordinating Anions—Fact or Fiction? A Survey of Likely Candidates". Angewandte Chemie International Edition. 43 (16): 2066–2090. doi:10.1002/anie.200300620. ISSN 1433-7851. PMID 15083452.
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