1-(2-bromoprop-2-enyl)-4-chlorobenzene

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:58.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 11.4 g (0.0494 mol) of 1-(2-bromo-allyl)-4-chloro-benzene in 20 ml of bromoform was added 0.686 g (0.00213 mol) tetrabutylammonium bromide. After heating to 58.5° C. for an hour, 10.7 ml (0.0494 mol) of 50% aqueous sodium hydroxide was added. This was repeated seven times over two days. After cooling to room temperature there was added hexanes and water. This mixture was gravity filtered through qualitative fluted filter paper. The resulting mixture was transferred to a separatory funnel and the phases were separated. The organic layer was dried over MgSO4 and filtered. The solvent was removed from the filtrate in vacuo. This residue was purified by column chromatography with hexanes to give 2.3 g of 2-(4-chlorophenylmethyl)-1,1,2-tribromocyclopropane. over two days After cooling to room temperature there filtered through qualitative fluted filter paper The resulting mixture was transferred to a separatory funnel the phases were separated The organic layer was dried over MgSO4 filtered The solvent was removed from the filtrate in vacuo This residue was purified by column chromatography with hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 8 ml (0.0622 mol) of 2,3-dibromopropene in 50 ml diethyl ether was placed under a nitrogen atmosphere by use of a Firestone valve. While cooling in an ice water bath, a solution of 62 ml (0.062 mol) of 1M 4-chlorophenylmagnesium bromide in diethyl ether was added slowly via addition funnel. After stirring for 2 hours while warming to room temperature, the reaction was recooled in an ice bath and 50 ml of 1 N hydrochloric acid was then added via syringe. The resulting mixture was transferred to a separatory funnel and the phases were separated. The organic layer was dried over MgSO4 and filtered. The solvent was removed from the filtrate in vacuo. The residue was triturated with cold pentanes to yield 12.0 g of 1-(2-bromo-allyl)-4-chloro-benzene as an oil which was used in without further purification. While cooling in an ice water bath the reaction was recooled in an ice bath The resulting mixture was transferred to a separatory funnel the phases were separated The organic layer was dried over MgSO4 filtered The solvent was removed from the filtrate in vacuo The residue was triturated with cold pentanes