反应详情

450 ml of ethanol were placed in the reaction vessel and admixed with Nal (10.5 g; 70 mmol) and KOH (67.3 g; 1.2 mol). A temperature rise from 25 to 40° C. was observed after addition of the KOH. After cooling to room temperature, 3-bromophenol (175.5 g; 1 mol) was added. The white suspension became beige during this addition. 3,7-dimethyloctyl chloride (186.32 g; 212.94 ml; 1.05 mol) was added over a period of 3 minutes by means of a dropping funnel. The mixture was stirred further for 2 hours at RT and subsequently for 96 hours at an internal temperature of 80° C. Ethanol was distilled off. The residue was taken up in ethyl acetate and the precipitate was separated off by filtration. The organic phase was extracted three times with 10% strength by weight aqueous NaOH solution, washed once with H2O, three times with H2O which had been acidified with CO2 and again with H2O. After drying over MgSO4, the solvent was again taken off on a rotary evaporator and the crude product was purified by fractional vacuum distillation.

1. customfrom 25 to 40° C.
2. additionThe white suspension became beige during this addition
3. distillationEthanol was distilled off
4. customthe precipitate was separated off by filtration
5. extractionThe organic phase was extracted three times with 10% strength by weight aqueous NaOH solution
6. washwashed once with H2O, three times with H2O which
7. dry with materialAfter drying over MgSO4
8. customthe solvent was again taken off on a rotary evaporator
9. distillationthe crude product was purified by fractional vacuum distillation