Cyanuric fluoride

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Cyanuric fluoride
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UN number 3389 1935
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Molar mass 135.047 g/mol
Appearance colourless liquid
Density 1.574 g/cm3
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Template:Longitem cyanuric acid, cyanuric chloride, cyanuric bromide

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Cyanuric fluoride or 2,4,6-trifluoro-1,3,5-triazine is a chemical compound with the formula (CNF)3. It is a colourless, pungent liquid. It has been used as a precursor for fibre-reactive dyes, as a specific reagent for tyrosine residues in enzymes, and as a fluorinating agent.[1]

It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.[2]

Preparation and reactions

Cyanuric fluoride is prepared by fluorinating cyanuric chloride. The fluorinating agent may be SbF3Cl2,[3] KSO2F,[4] or NaF.[5][6]

Cyanuric fluoride is used for the mild and direct conversion of carboxylic acids to acyl fluorides:[7]

File:Fluorination with cyanuric fluoride.svg

Other fluorinating methods are less direct and may be incompatible with some functional groups.[8]

Cyanuric fluoride hydrolyses easily to cyanuric acid and it reacts more readily with nucleophiles than cyanuric chloride.[4] Pyrolysis of cyanuric fluoride at 1300 °C is a way to prepare cyanogen fluoride:[9]

(CNF)3 → 3 CNF.

References

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