反应详情

A mixture of the compound (II) (12.0 g), 3,4,5,6-tetarhydrophthalic anhydride (7.56 g) and acetic acid (50 g) was heated at 90° to 95° C. for 7 hours. The reaction mixture was cooled to room temperature, and water (75 g) was added thereto. The precipitated crystals were collected by filtration to give the compound (I) (15.7 g).

1. temperaturewas heated at 90° to 95° C. for 7 hours
2. filtrationThe precipitated crystals were collected by filtration