Tributylphosphine → 33235-13-1

Temperature

0 °C

4,4-Dimethyl-5-nitropentan-2-one was made according to the literature procedure; see Kloetzel, M. C. J. Am. Chem. Soc., 69, pp. 2271-2275 (1947). Under a nitrogen atmosphere, a solution of nitropentanone (9.55 g, 60.0 mmol) was cooled to 0° C. Diethyl azodicarboxylate (11.5 g, 66 mmol) and tributylphosphine (26.71 g, 132 mmol) were sequentially added. The reaction was stirred for one hour at 0° C. and then for one hour at room temperature. The solvent was removed under reduced pressure, and the residue was purified by chromatography on a HORIZON HPFC system (65I cartridge, eluting with dichloromethane). The resulting oil was treated with hexane; a precipitate formed and was removed by filtration. The filtrate was concentrated under reduced pressure, and the residue was purified by chromatography on a HORIZON HPFC system (65I cartridge, eluting with 45% to 55% ethyl acetate in hexane) to provide 5.17 g of 2,2-dimethyl-4-oxopentanenitrile as a pale yellow oil.

1. waitfor one hour at room temperature
2. customThe solvent was removed under reduced pressure
3. customthe residue was purified by chromatography on a HORIZON HPFC system (65I cartridge, eluting with dichloromethane)
4. additionThe resulting oil was treated with hexane
5. customa precipitate formed
6. customwas removed by filtration
7. concentrationThe filtrate was concentrated under reduced pressure
8. customthe residue was purified by chromatography on a HORIZON HPFC system (65I cartridge, eluting with 45% to 55% ethyl acetate in hexane)

ORD record

ord-f5c3f43ca6d34565b50a7f201b3765b3

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07879849B2