Micellar Catalysis Of The Hydrolysis Of Aryltrifluoroacetates

Abstract

The neutral hydrolysis of aryl trifluoroacetates was investigated in micellar media of cetyl trimethylammonium bromide (CTAB) and sodium dodecylsulphate (SDS). The reaction is catalyzed by both CTAB and SDS micelles, with larger rate enhancement in CTAB. The reaction mechanism (B _AC 3) is the same in both micellar  media and their pseudophases as in non-micellar medium .The Hammett s-r relationship is obeyed with reaction constants (ρ) of +2.46 in non-micellar medium, +2.21 in CTAB, +2.30 in SDS micellar media and +1.79 and +2.18 in CTAB and SDS pseudophases, respectively.

Keywords: Micelles; Catalysis; Pseudophases; Hammett; Trifluoroacetates