Ethylene Glycol → 1-(4-Bromophenyl)cyclopropane-1-carboxylic acid

Temperature

100 °C

Sodium hydroxide, 50% aqueous solution (60.4 mL, 1.58 mol) was added to a mixture of 4-bromobenzeneacetonitrile (30 g, 0.2 mol), benzyltriethylammonium chloride (2.8 g, 0.012 mol), and 1-bromo-2-chloroethane (26.5 mL, 0.320 mol) at 50° C. for 5 hours. 1,2-ethanediol (306.0 mL, 5.491 mol) was added to the mixture and the resulting mixture was heated at 100° C. overnight. The mixture was poured into ice-water (60 mL) and was extracted with ethyl ether (2×150 mL). The aqueous phase was acidified (pH=2) with 1N HCl and was extracted with ethyl acetate (3×50 mL). The combined organic phase was washed with brine (100 mL), dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was the desired product (36.6 g) which was directly used in next step without further purification. 1H NMR confirmed the structure of the product.

1. extractionwas extracted with ethyl ether (2×150 mL)
2. extractionwas extracted with ethyl acetate (3×50 mL)
3. washThe combined organic phase was washed with brine (100 mL)
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customwas directly used in next step without further purification

ORD record

ord-5b73f294de4e440fbb1cbcf9a15666d7

Source dataset

uspto-grants-2010_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07776874B2