Microwave-assisted photooxidation of sulfoxides
Yuta Matsukawa1,2, Atsuya Muranaka1,3, Tomotaka Murayama3,4
1RIKEN Center for Sustainable Resource Science, Wako, Saitama, 351-0198, Japan.
Abstract:
We demonstrated microwave-assisted photooxidation of sulfoxides to the corresponding sulfones using ethynylbenzene as a photosensitizer. Efficiency of the photooxidation was higher under microwave irradiation than under conventional thermal heating conditions. Under the conditions, ethynylbenzene promoted the oxidation more efficiently than conventional photosensitizers benzophenone, anthracene, and rose bengal. Ethynylbenzene, whose T1 state is extremely resistant to intersystem crossing to the ground state, was suitable to this reaction because spectroscopic and related reported studies suggested that this non-thermal effect was caused by elongating lifetime of the T1 state by microwave. This is the first study in which ethynylbenzene is used as a photosensitizer in a microwave-assisted photoreaction.
More Related Videos
Related Concept Videos
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Preparation and Reactions of Sulfides
Oxidative Cleavage of Alkenes: Ozonolysis
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation of Alcohols
The process of oxidation in a chemical reaction is observed in any of the three forms:
Cycloaddition Reactions: MO Requirements for Photochemical Activation
Radical Autoxidation


