title: Cavitation-induced radical-chain oxidation of valeric aldehyde.
abstract: The application of high-amplitude ultrasound to liquids triggers cavitation. By the collapse of the thereby appearing vacuum cavities, high temperatures can be reached in a transient manner. The high temperatures in these hot-spots can lead to homolytic scission of chemical bonds. The thereby generated radicals are usually utilized in aqueous systems for the degeneration of organic pollutants. In this contribution, we demonstrate that the radicals can also be used for synthetic purposes: under an oxygen atmosphere, they trigger the oxidation of an aldehyde substrate.
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Neuenschwander
authors.forename: Jürg
authors.initials: J
authors.lastname: Neuenschwander
authors.forename: Ive
authors.initials: I
authors.lastname: Hermans
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry; D010084:Oxidation-Reduction; D013696:Temperature; D014465:Ultrasonics
chemical_list: D000447:Aldehydes; D005609:Free Radicals; C046012:pentanal