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 alpha,alpha-dibromoacetophenone, make the reaction synthetically useful.
Conte, V., Floris, B., Galloni, P., Silvagni, A. (2005). Oxybromination of ethynylbenzene catalysed by molybdenum complexes in organic solvent and in ionic liquids. ADVANCED SYNTHESIS & CATALYSIS, 347(10), 1341-1344 [10.1002/adsc.200505114].
Oxybromination of ethynylbenzene catalysed by molybdenum complexes in organic solvent and in ionic liquids
CONTE, VALERIA;FLORIS, BARBARA;GALLONI, PIERLUCA;
2005-01-01
Abstract
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 alpha,alpha-dibromoacetophenone, make the reaction synthetically useful.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
