反应详情

Pyridinium chlorochromate was prepared by following the procedure of E. J. Corey and J. W. Suggs, Tetrahedron Letters, 31, 2647 (1975). A solution of 11.8 g of 1-methylcyclopentanemethanol in 32 ml of anhydrous methylene chloride was added to a stirred suspension of 39.2 pyridinium chlorochromate in 312 ml of methylene chloride under argon. The resultant dark mixture was stirred for 1.5 hours at ambient temperature. A portion of ether was added to the resultant mixture and then the supernatant was decanted. The remaining dark residue was rinsed several times with ether. The combined ether solutions were filtered through a short pad of Florisil. The resultant solution was concentrated by distillation of ether and then the residue was distilled at 110 mm Hg to yield 6.41 g of 1-methylcyclopentanecarboxaldehyde as a colorless oil: bp 98°-100°; nmr (CDCl3) δ 1.12 (3H, s), 1.0-2.2 (8H, m) and 9.50 ppm (1H, s).

1. customthe supernatant was decanted
2. washThe remaining dark residue was rinsed several times with ether
3. filtrationThe combined ether solutions were filtered through a short pad of Florisil
4. concentrationThe resultant solution was concentrated by distillation of ether
5. distillationthe residue was distilled at 110 mm Hg