4,4'-Difluorobenzophenone

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4,4'-Difluorobenzophenone

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Template:Longitem	C13H8OF2
Molar mass	218.20 g/mol
Appearance	Colorless Solid
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4,4’-Difluorobenzophenone is an organic compound with the formula of (FC₆H₄)₂CO. This colorless solid is commonly used as a precursor to PEEK, or polyetherether ketone, a so-called high performance polymer. Because PEEK is resistant to attack, it is commonly used in carbon fiber coatings and cable insulation.

Synthesis

4,4’-Difluorobenzophenone is prepared by the acylation of fluorobenzene with p-fluorobenzoyl chloride. The conversion is typically conducted in the presence of an aluminium chloride catalyst in a petroleum ether solvent.

FC₆H₄C(O)Cl + C₆H₅F → (FC₆H₄)₂CO + HCl

Uses

The polymer PEEK is generated from the reaction of 4,4'-difluorobenzophenone with the salts of 1,4-benzenediol.

C₆H₄(ONa)₂ + (FC₆H₄)₂CO → 1/n[(C₆H₄O₂)(C₁₃H₈O)]_n + 2 NaF