反应详情

温度

140 °C

270 g of benzoic acid were placed in a stirred reaction vessel and melted. At from 125° to 130° C., there were added to the melt 82 g of tetrachlorophthalic anhydride followed by 19 g of 8-aminoquinaldine. The mixture was heated to 140° C. and stirred at that temperature for 2 hours and then heated to 160° C. and stirred for a further 2 hours. The reaction mixture was then cooled to 130° C. and there was added thereto a mixture of 400 ml of water and 160 g of 50% w/w caustic soda solution. The pigment suspension was filtered in vacuo, washed to neutrality with water and dried. There were obtained 82 g (98%) of quinophthalone of the formula ##STR5##

1. temperatureheated to 160° C.
2. stirringstirred for a further 2 hours
3. temperatureThe reaction mixture was then cooled to 130° C.
4. additionthere was added
5. filtrationThe pigment suspension was filtered in vacuo
6. washwashed
7. customdried