反应详情

20 g of 2-propoxy-4,6-dihydrazino-s-triazine (melting point 130° C) are dissolved in 200 ml of dimethylacetamide and treated with 32 g of salicyloyl chloride at 10° - 20°, over the course of 30 minutes, whilst stirring and cooling externally. The reaction is exothermic. The homogeneous reaction mixture is stirred for a further 30 minutes at 20° C and is subsequently clarified by filtration and slowly treated with 500 ml of water whilst stirring, whereupon the reaction product precipitates as a white solid. The precipitate is filtered of, washed with water, dried at 80° C and purified by recrystallisation from dioxane. The 2-propoxy-4,6-disalicyloylhydrazino-s-triazine obtained (Stabiliser No. 4) has a melting point of 258°-260° C.

1. temperaturecooling externally
2. stirringThe homogeneous reaction mixture is stirred for a further 30 minutes at 20° C
3. filtrationis subsequently clarified by filtration
4. additionslowly treated with 500 ml of water
5. stirringwhilst stirring, whereupon the reaction product
6. customprecipitates as a white solid
7. filtrationThe precipitate is filtered of,
8. washwashed with water
9. customdried at 80° C
10. custompurified by recrystallisation from dioxane