Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Acylation of -phosphoranium salts with -acyl chlorides gives the corresponding -perfluoro betaine in high yield. Subsequent chlorination or bromination regiospecifically yields the α,α-dihalofluoromethyl perfluoroalkyl ketones. ... -acyl chlorides are available from Aldrich, SCM, or Fluorochem. ...