반응 #50055

반응 방정식

water

sodium hydride

1,1-diethoxyethylphosphinic acid ethyl ester

bromomethylcyclohexane

→

1,1-diethoxyethyl(cyclohexylmethyl)phosphinic acid ethyl ester

용매

tetrahydrofuran

반응 조건

후처리

1. 1
   온도the temperature being maintained at from 20° to 25°
2. 2
   온도heating
3. 3
   온도under reflux
4. 4
   workup.WAITis effected for 24 hours
5. 5
   온도The suspension is cooled to 4°
6. 6
   기타Two phases are formed
7. 7
   기타The tetrahydrofuran phase is separated off
8. 8
   추출the aqueous phase is extracted twice with 250 ml of dichloromethane each time
9. 9
   농축Concentration
10. 10
    기타by evaporation
11. 11
    기타yields a brown oil which
12. 12
    workup.DISTILLATIONafter distillation under reduced pressure

실험 절차

21 g of 99% sodium hydride are suspended at room temperature under argon in 1000 ml of anhydrous tetrahydrofuran, and a solution of 172.2 g of 1,1-diethoxyethylphosphinic acid ethyl ester is added dropwise over a period of 2.5 hours, the temperature being maintained at from 20° to 25°. The reaction is exothermic and involves the evolution of gas. The batch is then stirred for 1.5 hours at room temperature, 142.2 g of bromomethylcyclohexane are added and heating under reflux is effected for 24 hours. The suspension is cooled to 4° and 250 rnl of water are carefully added. Two phases are formed. The tetrahydrofuran phase is separated off and the aqueous phase is extracted twice with 250 ml of dichloromethane each time. Concentration by evaporation yields a brown oil which, after distillation under reduced pressure, gives 1,1-diethoxyethyl(cyclohexylmethyl)phosphinic acid ethyl ester having a boiling point of 95° (1.8×10-4 mbar).

출처