Hexane → HCID 178442084, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 6.7 g of triphenylphosphine in 60 ml of methylene chloride was placed at -20° C. under argon gasification in a sulphonation flask equipped with a thermometer, dropping funnel and solid substance addition tube and treated within 5 minutes with 4.3 g of tetrabromomethane. The clear orange solution was stirred at -15° C. for a further 10 minutes and then a solution of 2.33 g of trans-4-[2-(4'-pentyl-4-biphenylyl)ethyl]cyclohexanecarboxaldehyde in 40 ml of methylene chloride was added dropwise at -5° C. within 10 minutes. The mixture was stirred at -5° C. for a further 10 minutes, then poured into 700 ml of hexane and freed from precipitated triphenylphosphine oxide by filtration. The concentrated filtrate was digested with 300 ml of hexane, filtered and concentrated. Low-pressure chromatography (0.5 bar) of the residue (3.5 g) on silica gel with 1% ethyl acetate/petroleum ether gave 2.87 g (87%) of 4-[2-[trans-4-(2,2-dibromovinyl)cyclohexyl]ethyl]-4'-pentylbiphenyl as colourless crystals.

Provenance & Evidence