Using LBuOOH with catalytic amounts of CrOg and TsOH, regioselective a-oxidation of alkynes to conjugated ynones was observed at room temperature with yields superior to those of stoichiometric chromium procedures. Yields were slighty decreased in the absence of p.toluenesulfonic acid. Chromium"' o
ChromiumVI complex catalyzed benzylic oxidations in the presence of tert.butyl hydroperoxide
β Scribed by Jacques Muzart
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- French
- Weight
- 202 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
In using t.BuOOH and a small quantity of 2,4-dimethylpentane-2,4-diol cyclic chromate, benzylic methylene groups are oxidised into carbonyl functions ; t.butylperoxy compounds are postulated as intermediates.
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## Abstract The cobaltβcatalyzed decomposition of __tert.__βbutyl hydroperoxide in the presence of a number of fiveβmembered heterocycles is described. With tetrahydrofuran displacement of the alphaβhydrogen atom by a peroxy group is observed; with furan and pyrrole 1.4 addition of peroxy radicals