Ethanol → 1-(Mercaptomethyl)cyclopropaneacetic acid ethyl ester

Temperature

20.5 °C

To a 3 L flask, a solution of 1-(mercaptomethyl)cyclopropaneacetic acid (204.5 g) in ethanol (1000 ml) was charged. 96% sulfuric acid (22.73 g) was added, and the reaction mixture was stirred for 3 h at 19-22° C. The reaction mixture was concentrated to ¼ of its volume at 50° C. under reduced pressure, and the residue was partitioned between water (1000 ml) and ethyl acetate (200 ml). The organic phase was separated, washed with 10% NaHCO3 (400 ml), and dried for 2 h over anhydrous sodium sulfate. The mixture was filtered and evaporated at 50° C., under reduced pressure, to afford 197.9 g of the crude 1-(mercaptomethyl)cyclopropaneacetic acid ethyl ester, as a slightly colored liquid with a strong, unpleasant odor.

1. concentrationThe reaction mixture was concentrated
2. customto ¼ of its volume at 50° C. under reduced pressure
3. customthe residue was partitioned between water (1000 ml) and ethyl acetate (200 ml)
4. customThe organic phase was separated
5. washwashed with 10% NaHCO3 (400 ml)
6. dry with materialdried for 2 h over anhydrous sodium sulfate
7. filtrationThe mixture was filtered
8. customevaporated at 50° C., under reduced pressure

ORD record

ord-17f05e5df63d4dc1bf912b8d95e4b9ce

Source dataset

uspto-grants-2009_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07547787B2