反应详情

温度

100 °C

The product (108.8 g) in Reference Example 1, namely 3-hydroxy-2-methylene-3-phenylpropionate methyl ester, is dissolved in acetic anhydride (113 ml; 1.20 mol), to which sulfuric acid (0.2 ml) is added, and the resulting mixture is stirred at 100° C. for 4 hours. The reaction solution is concentrated under reduced pressure, to give a crude product of the title compound at a yield of 143.9 g. 1H-NMR analysis reveals that the compound is a mixture of the E form and the Z form at a ratio of 87:13.

1. additionis added
2. concentrationThe reaction solution is concentrated under reduced pressure