Sodium borohydride → HCID 13066783, compound

To a stirred solution of 2,4-dimethyl-5-oxoheptanenitrile (IIb, 239 g, 1.56 moles) in isopropanol (2.5L) at 5° C. under a nitrogen atmosphere, was added sodium borohydride (60 g, 1.59 moles) over a 15 minute period. The mixture was stirred for 40 hours at room temperature, after which GC analysis indicated complete reaction. The reaction mixture was cooled to -5° C. and carefully quenched with water (1L) followed by saturated aqueous ammonium chloride (200 ml). After the gas evolution had subsided, the isopropanol was removed under reduced pressure (30 mm). The residue was extracted with diethyl ether (1×750 ml, 2×350 ml) and the combined organic layers washed with water (2×200 ml) and saturated aqueous sodium chloride (200 ml). After drying (MgSO4), the solvent was removed at reduced pressure (30 mm) and the crude product distilled at 75-80° C. and 0.20-0.10 mm to give a 88% yield of 2,4-dimethyl-5-hydroxyheptanenitrile (212 g, 1.37 moles).

1. customreaction
2. temperatureThe reaction mixture was cooled to -5° C.
3. customcarefully quenched with water (1L)
4. customthe isopropanol was removed under reduced pressure (30 mm)
5. extractionThe residue was extracted with diethyl ether (1×750 ml, 2×350 ml)
6. washthe combined organic layers washed with water (2×200 ml) and saturated aqueous sodium chloride (200 ml)
7. dry with materialAfter drying (MgSO4)
8. customthe solvent was removed at reduced pressure (30 mm)
9. distillationthe crude product distilled at 75-80° C.

ORD record

ord-0dd3406971e4410784e8de043e64f5a6

Source dataset

uspto-grants-1990_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04925985