반응 #6640

반응 방정식

aluminum chloride

4,4-dimethylchroman

Compound 76

4,4-dimethylchroman

acetyl chloride

hydrogen chloride

→

title compound

4,4-Dimethyl-6-acetylchroman

용매

ether

nitromethane

반응 조건

후처리

1. 1
   온도cooled in an ice bath
2. 2
   기타the organic layer separated
3. 3
   세척The organic layer was washed with water, saturated NaHCO3 and saturated NaCl solutions
4. 4
   건조dried (MgSO4)
5. 5
   기타Solvent was removed in vacuo
6. 6
   기타the residue purified by flash chromatography (silica; 10% ethyl acetate in hexanes)
7. 7
   workup.DISTILLATIONThis was followed by kugelrohr distillation (95-100 degrees C; 0.15 mm)

실험 절차

To a stirred solution 7.94 g (48.9425 mmol) of 4,4-dimethylchroman (Compound 76) in 70 ml of nitromethane was added under argon 4.0 g (50.96 mmol) of acetyl chloride followed by 6.8 g (51 mmol) of aluminum chloride. This was stirred at room temperature for 5.5 hours and then cooled in an ice bath and treated slowly with 70 ml of 6N hydrogen chloride. The resultant mixture was stirred at room temperature for 10 minutes and then treated with 100 ml ether and the organic layer separated. The organic layer was washed with water, saturated NaHCO3 and saturated NaCl solutions and dried (MgSO4). Solvent was removed in vacuo and the residue purified by flash chromatography (silica; 10% ethyl acetate in hexanes). This was followed by kugelrohr distillation (95-100 degrees C; 0.15 mm) to give the title compound as a colorless oil. PMR (CDCl3): δ 1.40 (6H), 1.95-2.00 (2H, m), 2.58 (3H), 4.25-4.30 (2H, m), 6.83 (1H, d, J~18.0 Hz), 7.62 (1H, dd, J~8.0 Hz, 1.5 Hz), 8.00 (1H, d, J~1.5 Hz).

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