Relative Reactivities of Tethered Functional Groups in the Interior of a Zeolite
作者:Wenhui Zhou、Edward L. Clennan
DOI:10.1021/ol991275q
日期:2000.2.1
[reaction: see text] The reactions of singlet oxygen with substrates containing both sulfide and olefinic linkages have been examined. The dramatic increase in sulfoxide formation in the interior of the zeolite in comparison to solution is attributed to zeolite stabilization of the persulfoxide intermediate and concomitant inhibition of physical quenching of singlet oxygen.
Mechanistic Organic Chemistry in a Microreactor. Zeolite-Controlled Photooxidations of Organic Sulfides
作者:Edward L. Clennan、Wenhui Zhou、Jacqueline Chan
DOI:10.1021/jo0261808
日期:2002.12.1
The intrazeolite and solution photooxygenations of a series of sulfides have been compared. The unusual zeolite environment enhances the rates of reaction, it suppresses the Pummerer rearrangements, and it has a dramatic effect on the sulfoxide/sulfone ratio. A detailed kinetic study utilizing trapping experiments and intramolecular competition provides evidence for cation complexation to a persulfoxide