Reacción #833542

Ecuación de reacción

16bromohexadecanoic acid

HCl

sodium

NaOH

thioacetic acid

→

desired product

Rendimiento 97.2%

16-Mercaptohexadecanoic acid

Rendimiento 97.2%

Disolventes

methanol

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONAt the end of the addition reaction mixture
2. 2
   workup.STIRRINGAfter additional 10 min of stirring
3. 3
   workup.ADDITIONwere added
4. 4
   TemperaturaThe resulted mixture was refluxed for 15 hrs
5. 5
   Temperaturato cool to RT
6. 6
   TemperaturaAdditional refluxing for 3 hrs
7. 7
   Otrorequired for reaction completion
8. 8
   OtroResulted
9. 9
   Otroreaction mixture
10. 10
    Temperaturawas cooled with ice bath
11. 11
    workup.ADDITIONpoured
12. 12
    workup.STIRRINGwith stirring, into a vessel
13. 13
    Extracciónextracted with 300 ml of ether
14. 14
    OtroThe organic layer was separated
15. 15
    Lavadowashed with 3×150 ml of water, 150 ml of saturated NaCI aqueous solution
16. 16
    Secadodried over sodium sulfate
17. 17
    OtroAfter removal of ether material
18. 18
    Otrowas purified by recrystallization from n-hexane
19. 19
    Filtraciónfiltering out
20. 20
    Otrodrying over high vacuum

Procedimiento

Under inert atmosphere 2.0 gr of sodium metal suspension (40% in mineral oil) were slowly added to 100 ml of dry methanol at 0° C. At the end of the addition reaction mixture was stirred for 10 min at RT and 1.75 ml (21.58 mmole) of thioacetic acid were added. After additional 10 min of stirring, 30 ml degassed methanolic solution of 6.1 gr (18.19 mmole) of 16bromohexadecanoic acid were added. The resulted mixture was refluxed for 15 hrs, after which, allowed to cool to RT and 50 ml of degassed 1.0 M NaOH aqueous solution were injected. Additional refluxing for 3 hrs required for reaction completion. Resulted reaction mixture was cooled with ice bath and poured, with stirring, into a vessel containing 200 ml of ice water. This mixture was titrated to pH=7 by 1.0 M HCl and extracted with 300 ml of ether. The organic layer was separated, washed with 3×150 ml of water, 150 ml of saturated NaCI aqueous solution and dried over sodium sulfate. After removal of ether material was purified by recrystallization from n-hexane, filtering out and drying over high vacuum. 5.1 gr (97% yield) of the desired product was obtained.

Fuente