反应详情

温度

20 °C

The procedure described in Example 19 was repeated by using 3.0 g 4-carboxybenzaldehyde and 3.06 g 1,3-dicyclopropyl-1,3-propanedione. Yield 1.7 g, mp 175°-178° C. in trifluoroacetic acid (10 ml) thionylchloride (4 ml) and catalytic amount of water (0,05 ml) were added at room temperature. The solution was stirred over right at 20° C. The solvent was evaporated and the residue was destilled in vacuo, bp 110° C./1,5 mbar. Yield 5,3 g (41%).

1. customThe solvent was evaporated