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Hexafluoroacetone trihydrate, also known as gem diol, hexafluoropropan-2,2- diol, is a covalent hydrate of the ketone. It could used as a structure stabilizer for peptides. It was a metabolite of aerosol propellant HFA-227 and is present in the urine. It was shown to undergo an efficient carbonyl-ene reaction with a variety of alkenes in the presence of molecular sieves under microwave heating and conventional heating producing hexafluoroisopropanol functionalized derivatives in high yields[1-2].

Hexafluoroacetone trihydrate (HFA?3H2O) is used to produce Sevoflurane,a high quality anesthetic and Bisphenol AF, a crosslinker for fluoroelastomers. It can also be used to produce various high-end fluorinated products such as fluorinated polyimide, etc.

[1] Sridhar M, et al. A facile method for the preparation of hexafluoroisopropanol functionalized derivatives using hexafluoroacetone trihydrate via a carbonyl-ene reaction. Tetrahedron Letters, 2009; 50: 1777-1779.
[2] K?ster U, et al. Biotransformation of the aerosol propellant 1,1,1,2,3,3,3-heptafluoropropane (HFA-227): lack of protein binding of the metabolite hexafluoroacetone. Drug Metabolism and Disposition , 1996.