반응 #820633

반응 방정식

n-BuLi

n-BuLi

phenylphosphine

THF

THF

n-BuLi

→

(R,R)-2,5-Dimethyl-1-phenyl-phospholane

수율 71.0%

용매

water

반응 조건

후처리

1. 1
   온도After cooling again to −78° C.
2. 2
   workup.STIRRINGby stirring at 25° C. for 3 hours
3. 3
   온도the mixture is cooled again
4. 4
   workup.STIRRINGstirring
5. 5
   workup.WAITis continued overnight
6. 6
   추출extracted with 50 ml of methylene chloride
7. 7
   기타After the phase separation the solvent
8. 8
   기타is removed
9. 9
   workup.DISTILLATIONthe residue is distilled in vacuo
10. 10
    기타An almost colourless syrup is obtained in a yield of 71% (1.95 g)

실험 절차

One equivalent of n-BuLi (8.9 ml, 1.6 M. solution in n-hexane) is added slowly to a solution of 1.57 g phenylphosphine (14.3 mmol) in 100 ml of THF at −78° C. This is then stirred for a further two hours at room temperature. After cooling again to −78° C., one equivalent of the cyclic sulfate 1 in 10 ml of THF is added via a cannula and the reaction is allowed to end by stirring at 25° C. for 3 hours. Before adding a further 1.2 eq. of n-BuLi (9.8 ml) via syringe, the mixture is cooled again, n-BuLi is added and stirring is continued overnight. For the work-up, the solvent was drawn off in vacuo and the residue taken up in 5 ml of water and extracted with 50 ml of methylene chloride. After the phase separation the solvent is removed and the residue is distilled in vacuo. An almost colourless syrup is obtained in a yield of 71% (1.95 g).

출처