反应详情

In the same reactor used in Example 2D, there were placed 26.5 g (0.27 mole) of maleic anhydride, 0.7 g of phosphoric acid and 150 ml of mixed xylene. A solution was then added dropwise thereto, the solution having been prepared by thermally dissolving 52.8 g (0.1 mole) of 1,4-bis[4-(3-aminophenoxy)-α,α-dimethylbenzyl]benzene obtained in Example 1D in a mixture of 100 ml of mixed xylene and 50 ml of N,N-dimethylformamide. A dropping time of 5 hours and an aging time of 2 hours were used in order to carry out the reaction. The reaction solution was concentrated to about 1/2 the original amount and then cooled. When a temperature of 80° C. had been reached, 50 g of water was added thereto. Afterward, the solution was slowly cooled, so that crystals precipitated. The precipitated crystals were then cooled to room temperatures filtered; and washed with cold methanol. 67.1 g of desired crude 1,4-bis[4-(3-maleimi-dophenoxy)-α, α-dimethylbenzyl]benzene was obtained.

1. additionA solution was then added dropwise
2. customthe solution having been prepared
3. customA dropping time of 5 hours
4. customan aging time of 2 hours
5. customthe reaction
6. concentrationThe reaction solution was concentrated to about 1/2 the original amount
7. temperaturecooled
8. customa temperature of 80° C.
9. addition50 g of water was added
10. temperatureAfterward, the solution was slowly cooled, so that crystals
11. customprecipitated
12. temperatureThe precipitated crystals were then cooled to room temperatures
13. filtrationfiltered
14. washand washed with cold methanol