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4,4'-Difluorobenzophenone

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

References

R.D. Dunlop and John H. Gardner. (1933). "Preparation of Fluorbenzophenones". [[J. Am. Chem. Soc.]].
David Parker, Jan Bussink, Hendrik T. van de Grampe, Gary W. Wheatley, Ernst-Ulrich Dorf, Edgar Ostlinning, Klaus Reinking "Polymers, High-Temperature" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2002.

Info: Wikipedia Source

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4-fluorophenyl-compounds benzophenones

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