反应详情

To a suspension of styrene (3.00 g) and rhodium(II) acetate dimer (40.0 mg) in 1,2-dichloroethane (29.0 mL), a solution of ethyl diazoacetate (3.03 mL) in 1,2-dichloroethane (29.0 mL) was added over a period of 4 hours and the mixture was stirred at room temperature for 19 hours. The reaction mixture was concentrated under reduced pressure and purified by silica gel column chromatography (n-hexane:diethyl ether=20:1) to give ethyl trans-2-phenylcyclopropanecarboxylate as a colorless oil (2.42 g) and ethyl cis-2-phenylcyclopropanecarboxylate as a colorless oil (1.51 g).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. custompurified by silica gel column chromatography (n-hexane:diethyl ether=20:1)