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
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.
Isolable and Readily Handled Halophosphonium Pre-reagents for Hydro- and Deuteriohalogenation
作者:Florian T. Schevenels、Minxing Shen、Scott A. Snyder
DOI:10.1021/jacs.6b12653
日期:2017.5.10
and acid-sensitive moieties, particularly polyenes prone to cyclization. The process is also challenging when conducted on a small scale, and moreover, methods for the addition of their deuterated counterparts typically require special techniques, especially when control of stoichiometry is required. Herein is described a readily synthesized and handled reagent class which can accomplish the controlled
A novel cross-coupling reaction of alkylarylsulfides with aryl Grignard reagents has been achieved to produce the alkenyl-aryl coupling products in high yields by using catalytic Ni(cod)(2) and a bulky N-heterocyclic carbene ligand, SIPr.