Peroxomolybdate mediated oxidation of thioanisole in cationic and anionic microemulsions. Direct and indirect oxygen transfer

Chiarini, Marco; Bunton, Clifford A.

doi:10.1016/j.colsurfa.2004.07.016

The reaction of the tetraperoxomolybdate dianion, Mo(O2)42−, with thioanisole, PhSMe, in reverse micelles of cetylpyridinium chloride (CPyCl), in CHCl3 is initially first-order in each reactant, indicating that this reaction involves direct oxygen transfer, and is faster than interconversion of the tri- and tetra-peroxomolybdates. Reaction is probably in the interfacial region surrounding the aqueous microdroplet. Direct oxygen transfer is very slow in anionic water-in-oil (w/o) microemulsions of AOT in hexane, or sodium dodecylsulfate (SDS) and n-butyl alcohol (n-BuOH) in CHCl3. There is oxidation involving singlet oxygen which escapes into the organic solvent and is trapped by PhSMe. This reaction is slower than the direct oxygen transfer from Mo(O2)42− in the cationic microemulsion.

Titolo:	Peroxomolybdate mediated oxidation of thioanisole in cationic and anionic microemulsions. Direct and indirect oxygen transfer
Autori:	CHIARINI, MARCO Bunton, Clifford A. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2004
Rivista:	COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Abstract:	The reaction of the tetraperoxomolybdate dianion, Mo(O2)42−, with thioanisole, PhSMe, in reverse micelles of cetylpyridinium chloride (CPyCl), in CHCl3 is initially first-order in each reactant, indicating that this reaction involves direct oxygen transfer, and is faster than interconversion of the tri- and tetra-peroxomolybdates. Reaction is probably in the interfacial region surrounding the aqueous microdroplet. Direct oxygen transfer is very slow in anionic water-in-oil (w/o) microemulsions of AOT in hexane, or sodium dodecylsulfate (SDS) and n-butyl alcohol (n-BuOH) in CHCl3. There is oxidation involving singlet oxygen which escapes into the organic solvent and is trapped by PhSMe. This reaction is slower than the direct oxygen transfer from Mo(O2)42− in the cationic microemulsion.
Handle:	http://hdl.handle.net/11575/10999
Appare nelle tipologie:	1.1 Articolo in rivista

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