Reaktion #461416

Reaktionsgleichung

LiAlH4

4,4'-bis (methoxycarbonyl)biphenyl

→

4,4'-bis (hydroxymethyl) biphenyl

Ausbeute 96.7%

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturheating bath
2. 2
   workup.ADDITIONis added dropwise, over a period of 1 hour, to the mixture
3. 3
   Temperaturthe mixture is cooled to ambient temperature
4. 4
   Sonstigethe excess LiAlH4 is destroyed by the careful addition of 15 ml of a THF/H2O (80:20) mixture
5. 5
   FiltrationThe reaction mixture is filtered on Septum G2
6. 6
   Waschenwashing the precipitate with anydrous ethanol (3×100 ml)
7. 7
   SonstigeThe combined filtrate and washings are evaporated to dryness under vacuum with the heating bath at 40° C
8. 8
   workup.DISSOLUTIONThe residue is then redissolved with 100 ml of hot acetone (50° C.)
9. 9
   Filtrationby filtration
10. 10
    Trocknendried on anhydrous Na2SO4
11. 11
    Sonstigeevaporated to dryness

Vorschrift

789 mg (20.8 mmoles) of LiAlH4 in 150 ml of anhydrous THF (tetrahydrofuran) are placed in a 2-liter flask which has a mechanical agitator, cooler, filler funnel and heating bath. A solution, heated to 50° C., of 7.5 g (27.7 mmoles) of 4,4'-bis (methoxycarbonyl)biphenyl in 500 ml of anhydrous THF is added dropwise, over a period of 1 hour, to the mixture, heated in an inert atmosphere to 50° C. under agitation. After a further 30 minutes of agitation in a heating bath, the mixture is cooled to ambient temperature and the excess LiAlH4 is destroyed by the careful addition of 15 ml of a THF/H2O (80:20) mixture. The reaction mixture is filtered on Septum G2, washing the precipitate with anydrous ethanol (3×100 ml). The combined filtrate and washings are evaporated to dryness under vacuum with the heating bath at 40° C. The residue is then redissolved with 100 ml of hot acetone (50° C.), eliminating the insoluble residue by filtration, dried on anhydrous Na2SO4 and evaporated to dryness. 5.74 g of 4,4'-bis (hydroxymethyl) biphenyl are obtained with a molar yield of 96.6%.

Quelle