反应详情

温度

67.5 °C

Cyclopentanone (5.000 g, 59.44 mmol; CAS #120-92-3, purchased from Aldrich) was dissolved in hexanes (90 mL). t-Butyl carbazate (7.860 g, 59.47 mmol) was added and the mixture was heated at 65-70° C. for 1 hour. The mixture was cooled and concentrated in vacuo. The residue was taken up in isopropanol (25 mL)-ether (25 mL)-hexanes (50 mL) and chilled. The crystalline material was collected by filtration to give N′-cyclopentyl-hydrazinecarboxylic acid tert-butyl ester (5.51 g; 47%). A second crop (2.62 g, 22%) was collected from the mother liquor.

1. temperatureThe mixture was cooled
2. concentrationconcentrated in vacuo
3. temperaturechilled
4. filtrationThe crystalline material was collected by filtration