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Studies on the Pauson–Khand reaction of alkynyl sulfoxides. Unexpectedly easy racemization of their dicobalt hexacarbonyl complexes by Elvira Montenegro; Albert Moyano; Miquel A Pericàs; Antoni Riera *; Angel Alvarez-Larena; Joan-F Piniella is a Chemistry article available to read on EtoBox.
What is Studies on the Pauson–Khand reaction of alkynyl sulfoxides. Unexpectedly easy racemization of their dicobalt hexacarbonyl complexes about?
The scope and limitations of the Pauson-Khand reactions of alkynyl sulfoxides with strained alkenes have been studied. (S)-1-Hexynyl p-tolyl sulfoxide and (S)-2-phenylethynyl p-tolyl sulfoxide afforded β-(p- tolylsulfinyl)enones in moderate yields and low diastereoselectivities. The diastereomeric mixtures were easily separated by column chromatography and the sulfinyl group could be cleaved by a sequence involving reduction to sulfide, carbonyl reduction and enol thioether hydrolysis to afford 1,3-rearranged enantiomerically enriched α-butyl and α-phenyl enones. The absolute configuration of the Pauson-Khand adducts was determined by X-ray diffraction. The decreased enantiomeric excess of the final products uncovered an unprecedented low temperature racemization of the hexacarbonyl dicobalt complexes of alkynyl sulfoxides.
Who reads Studies on the Pauson–Khand reaction of alkynyl sulfoxides. Unexpectedly easy racemization of their dicobalt hexacarbonyl complexes?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Elvira Montenegro; Albert Moyano; Miquel A Pericàs; Antoni Riera *; Angel Alvarez-Larena; Joan-F Piniella
- Publisher
- Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0957-4166)
- Published
- 1999
- Language
- EN
- Field
- Chemistry (Physical Sciences)