title: Temperature effects upon aqueous micellar-assisted decarboxylation of 6-nitrobenzisoxazole-3-carboxylate and its 5-methyl derivative.
abstract: An investigation of temperature effects upon first-order rate constants in the micellar pseudophase for decarboxylation of 6-nitrobenzisoxazole-3-carboxylate (6-NBIC) and its 5-methyl derivative (6-NBIC-5-Me) was carried out. Surfactants used were cationic cetyltrialkylammonium bromide with alkyl = methyl (CTABr), ethyl (CTEABr), n-propyl (CTPABr), and n-butyl (CTBABr). The investigation shows that micelles speed up reactions by decreasing enthalpies of activation. Increase in head group bulk further speeds reactions still by a small decrease in the enthalpies, for both substrates. Values of DeltaH# and DeltaS# for 6-NBIC in the various surfactants give linear isokinetic plot, with CTBABr as outlier.
authors.affiliation: CEMIN, Centro di Eccellenza Materiali Innovativi Nanostrutturati, Dipartimento di Chimica, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy.
authors.forename: Lucia
authors.initials: L
authors.lastname: Brinchi
authors.forename: Raimondo
authors.initials: R
authors.lastname: Germani
authors.forename: Laura
authors.initials: L
authors.lastname: Goracci
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Savelli
authors.forename: Nicoletta
authors.initials: N
authors.lastname: Spreti
authors.forename: Pietro
authors.initials: P
authors.lastname: Di Profio