Potassium Hydroxide → Ethyl 2-benzylacrylate

関与物質

反応手順

A mixture of KOH (8.5 g) in ethanol (100 mL) was added at room temperature to benzylmalonic acid diethyl ester (40 g) in ethanol (80 mL) and the whole was stirred at room temperature overnight, then concentrated by evaporation, thereafter water (14 mL) was added and then the mixture was acidified in an ice bath with concentrated hydrochloric acid (12.6 mL). Partitioning between water and ether was carried out, the organic phase was dried and the ether was distilled off. Then, pyridine (26 mL), piperidine (1.22 g) and paraformaldehyde (3.56 g) were added to the residue. The mixture was heated in an oil bath (130° ) for 90 minutes, cooled, water (440 mL) were added and extraction was carried out 3 times with n-hexane (150 mL). The combined organic phases were washed with water, 1N HCl, water, saturated NaHCO3 solution and brine. The solution was dried (MgSO4) and evaporated to give the title compound as colourless oil (26 g, 85% yield). 1H NMR: 300 MHz spectrum consistent with proposed structure.

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