Carbon tetrabromide → (6-Bromohexyl)benzene

A solution of 6-phenylhexanoic acid (19.8 mmoles) in sieve dried tetrahydrofuran (5 ml) and reduced with diborane in tetrahydrofuran (30 ml, 29.1 mmoles) at 0° C. for 4 hours to give 6-phenylhexanol. To an ice cold solution of the hexanol (ca. 19.8 mmoles) and carbon tetrabromide (21.98 mmoles) in methylene chloride (50 ml) was added triphenylphospine (22.30 mmoles) in methylene chloride (50 ml) and the resulting solution was stirred for 2.5 hours. The volatiles were evaporated and the residue was taken up in ether (100 ml), cooled in ice, and filtered. The filtrate was evaporated and distilled to afford 6-phenylhexyl bromide as an oil. A mixture of the bromide (8.00 mmoles), salicylaldehyde (8.19 mmoles) and potassium carbonate (9.33 mmoles) in dimethylformamide (10 ml) was heated to 100° C. and maintained at that temperature for one hour. The cooled reaction mixture was taken up in hexane (50 ml) and washed with 5% sodium hydroxide (50 ml) and saturated sodium chloride (50 ml). The organic phase was dried over anhydrous magnesium sulfate and charcoal. Evaporation yielded a colorless oil which was purified by flash chromatography over silica gel with 5% ethyl acetate in hexane as eluant to afford the desired product as an oil.

1. customThe volatiles were evaporated
2. temperaturecooled in ice
3. filtrationfiltered
4. customThe filtrate was evaporated
5. distillationdistilled

ORD record

ord-f55d140d8f09475db886e6ada14ce7c3

Source dataset

uspto-grants-1989_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04820719