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A stirred solution of 3,3-dicyclohexylpropionic acid (15.2 g, 0.064 mol) in 225 ml of dichloromethane was cooled to 5° C. and treated with 6.8 ml (0.078 mol) of oxalyl chloride, followed by 10 drops of dimethylformamide. The cooling bath was removed and stirring was continued at room temperature. Gas evolution, which was vigorous initially, essentially ceased after 1 hour. After 3 hours, dichloromethane and excess oxalyl chloride were removed on a rotary evaporator. The residue was taken up in dichloromethane and the evaporation was repeated to give 16.1 g of a pale yellow oil.

1. customThe cooling bath was removed
2. customwas continued at room temperature
3. waitAfter 3 hours
4. customdichloromethane and excess oxalyl chloride were removed on a rotary evaporator
5. customthe evaporation