反应详情

A suspension of 1.0 parts of 4-oxo-7-(3-[2-propylphenoxy]propoxy)-4H-1-benzopyran-2-carboxamide in 10 parts of dioxane and 10 parts of 10% v /v sulphuric acid was heated on a steam can for eight hours. The solid obtained on cooling was collected, washed with water and crystallised from acetone to give 0.75 parts of 4-oxo-7-(3-[2-propylphenoxy]propoxy)-4H-1-benzopyran-2-carboxylic acid, m.pt. 164°-166°.

1. temperaturewas heated on a steam can for eight hours
2. customThe solid obtained
3. temperatureon cooling
4. customwas collected
5. washwashed with water
6. customcrystallised from acetone