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Oxybromination of Ethynylbenzene Catalysed by Molybdenum Complexes in Organic Solvent and in Ionic Liquids

✍ Scribed by Valeria Conte; Barbara Floris; Pierluca Galloni; Adriano Silvagni

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 75 KB
Volume: 347
Category: Article
ISSN: 1615-4150
DOI: 10.1002/adsc.200505114

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✦ Synopsis

The molybdenum(VI)-catalysed oxybromination of ethynylbenzene was performed with hydrogen peroxide as oxidant and potassium bromide as source of bromine, in a two-phase water/solvent system, where solvent was either dichloromethane or an ionic liquid. The selectivity was toward 1,2-dibromostyrene when performed in water/dichloromethane. In ionic liquids better yields and shorter reaction times were obtained that, together with the complete ethynylbenzene conversion and the preferred formation of a,a-dibromoacetophenone, make the reaction synthetically useful.

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