Base-catalyzed reaction of acetohydroxamic acid in micellar media containing β-cyclodextrin

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 0 I 0, India E-mail : kallolkghosh@yahoo.com Fax : 91-0711-262583 Manuscript received 8 March 2002, revised 8 July 2002, accepted 12 July 2002 The kinetics of the base-catalyzed hydrolysis of acetohydroxamic acid (CH3CONHOH) have been studied in media containing sodium dodecyl sulfate (SDS) or tetradecyltrimethylammonium bromide (TTAB) micelles and β-cyclodextrin (β-CD). The presence of β-CD inhibits the hydrolysis. Both β-CD-SDS and β-CD-TTAB systems exhibit inhibitory and catalytic effects. This behnvior is explained in terms of two simultaneous processes, i.e. complexation/micellization. The CMC both in the absence and in the presence of β-CD have been determined conductometrically. These data indicate that the association process between the β-CD and surfactant has higher affinity than the micellization process