反应详情

温度

20 °C

5.6 parts of potassium t-butylate are added to a suspension of 5.8 parts of 1,4-diketo-3,6-diphenylpyrrolo-[3,4-c]-pyrrole in 70 parts of dimethylformamide at 20° C. and the mixture is stirred at 20° C. for 1 hour. 7.6 parts of benzyl chloride are then added to the mixture and the mixture is kept at 65° C. for 2 hours. After cooling to 20° C., the reaction product is filtered off and washed with a little dimethylformamide and then with acetone and hot water. After drying, 4.5 parts of 1,4-diketo-2,5-dibenzyl-3,6-diphenylpyrrolo-[3,4-c]-pyrrole (formula XVII) are obtained and, if necessary, can be crystallised from dimethylformamide. Yellow-orange crystals of melting point 290°-292° C. are formed. ##STR21##

1. waitthe mixture is kept at 65° C. for 2 hours
2. temperatureAfter cooling to 20° C.
3. filtrationthe reaction product is filtered off
4. washwashed with a little dimethylformamide
5. customAfter drying