反应详情

3,4,5,6-tetrafluoro-2-toluic acid (500 mg) was dissolved in dry diethyl ether (5.0 ml) added dropwise to a suspension of lithium aluminium hydride (100 mg) in dry ether (10 ml) under an argon atmosphere at the ambient temperature. When the addition was complete and the effervescence had subsided the mixture was heated at the reflux temperature for a period of 1 hour. After allowing the mixture to cool to the ambient temperature water (10 ml) was cautiously added and the resultant mixture extracted with diethyl ether (2×20 ml), the extracts washed with water and dried over anhydrous magnesium sulphate. After filtration the filtrate was concentrated by evaporation of the solvent. The residual low melting solid was recrystallised from petroleum ether (boiling range 40°-60° C.) to yield 2-methyl-3,4,5,6-tetrafluorobenzyl alcohol (200 mg). N.m.r.

1. additionWhen the addition
2. temperaturewas heated at the reflux temperature for a period of 1 hour
3. additionwas cautiously added
4. extractionthe resultant mixture extracted with diethyl ether (2×20 ml)
5. washthe extracts washed with water
6. dry with materialdried over anhydrous magnesium sulphate
7. filtrationAfter filtration the filtrate
8. concentrationwas concentrated by evaporation of the solvent
9. customThe residual low melting solid was recrystallised from petroleum ether (boiling range 40°-60° C.)