Caprolactam → 1-Propylazepan-2-one

In a 1 liter 3-neck flask equipped with a dry ice-isopropanol condenser, an addition funnel and a mechanical stirrer was placed 10.2 g of 50% sodium hydride-mineral oil dispersion (5.1 g NaH, 0.2125 M) and 150 ml of petroleum ether. The suspension was momentarily stirred and then sodium hydride was allowed to settle. Most of the petroleum ether was pipetted out and 200 ml of dry toluene was added. To this was added dropwise a solution of 20 g (0.177 M) of azacycloheptan-2-one in 100 ml of dry toluene. The mixture was refluxed for 1 hour and then cooled to room temperature. A solution of 30.75 g (0.25 M) of 1-bromopropane in 100 ml of dry toluene was added dropwise under stirring. Upon completion of the addition, the mixture was warmed to 80°-100° and the temperature was maintained there for 4 hours. Then the isopropanol-dry ice condenser was replaced with a water condenser and the reaction mixture was heated to reflux for 15 hours. The reaction mixture was cooled, filtered and the filtrate was concentrated to a yellow oil. Distillation afforded 22.2 g (81%) of colorless product; b.p. 83°-86°/0.25 mm.

1. customIn a 1 liter 3-neck flask equipped with a dry ice-isopropanol condenser, an addition funnel and a mechanical stirrer
2. additionwas added
3. temperatureThe mixture was refluxed for 1 hour
4. stirringunder stirring
5. additionUpon completion of the addition
6. temperaturethe mixture was warmed to 80°-100°
7. temperaturethe temperature was maintained there for 4 hours
8. temperaturethe reaction mixture was heated
9. temperatureto reflux for 15 hours
10. temperatureThe reaction mixture was cooled
11. filtrationfiltered
12. concentrationthe filtrate was concentrated to a yellow oil
13. distillationDistillation

ORD record

ord-bfc237f212c4457e84830b79914e4be5

Source dataset

uspto-grants-1984_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04444762