反应详情

A solution of di-isobutylphosphinyl chloride* (3.9g., 0.02 mole) in tetrahydrofuran (50 ml.) was added dropwise to a refluxing solution of n-heptylmagnesium bromide (prepared from magnesium turnings (1.2g., 0.05 mole), n-heptyl bromide (9.0g., 0.05 mole) and tetrahydrofuran (100 ml.)). The mixture was heated under reflux for 18 hours. After cooling to room temperature, the reaction mixture was poured onto ice and 2N HCl (300 ml.), and extracted with methylene dichloride (4 × 200 ml.). The combined extracts were washed with lithium hypochlorite solution, 2N NaOH solution and finally with water, then dried (MgSO4). The solvent was removed by distillation and the residual yellow oil (8g.) was eluted with chloroform down a silica gel column. The product (Rf = 0.1- 0.2 on silica t.l.c. (CHCl3)) was finally distilled to yield diisobutyl-n-heptyl-phosphine oxide as a colourless liquid, bp. 120°-2°/0.03 mm. (Found C 68.8; H 13.0; C15H33OP requires C 69.3; H, 12.7%.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 18 hours
3. extractionextracted with methylene dichloride (4 × 200 ml.)
4. washThe combined extracts were washed with lithium hypochlorite solution, 2N NaOH solution and finally with water
5. dry with materialdried (MgSO4)
6. customThe solvent was removed by distillation
7. washthe residual yellow oil (8g.) was eluted with chloroform down a silica gel column
8. distillationThe product (Rf = 0.1- 0.2 on silica t.l.c. (CHCl3)) was finally distilled