acyl

wherein [R.sub.f] is a perfluorinated group optionally containing one or more heteroatoms; [R.sup.1] is a divalent alkylene group, arylene group or mixture thereof, substituted with one or more heteroatoms or functional groups, containing about one to about 16 carbon atoms; [R.sup.2] is a lower alkyl group; X is a halide, a lower alkoxy group or an acyloxy group; and x is 0 or 1.

[P.sub.2][O.sub.5]/[H.sub.3]P[O.sub.4] (PPA) was found to be an efficient new reagent for probing the mechanism of acylation reactions and Fries rearrangement of acyloxy benzene derivatives and also the direct acylation reactions of phenol derivatives with Carboxylic acids.

Alcohols, carbonyls, and carboxylic acids enhance the formation of secondary ozonides, as well as alkoxy and acyloxy hydroperoxides, from stabilized Criegee intermediates formed in [O.sub.3]--alkene reactions (Docherty et al.

The observed HMBC correlations between the carbonyl carbon of the acyloxy part (C-l 8 173.4) and the C-l' methylene protons of tyrosol (8 4.22 and 4.19) further supported that this new substance is 4-hydroxyphenethyl 3-hydroxy-5-phenylpentanoate (1).

R can also consist of hydrogen, alkoxy, acyloxy or alkylamino or other functional groups.