反应详情

A solution of 1164 g (6 mols) of α,α'-dihydroxy-p-diisopropyl benzene in 5490 g (45 mols) of 2,4-dimethyl phenol is added dropwise with stirring over a period of 9 to 10 hours at 150° C in a nitrogen atmosphere to a solution of 1830 g (15 mols) of 2,4-dimethyl phenol. At the same time, about 200 to 210 g of water distilled over. The reaction mixture is stirred for 15 minutes, the catalyst is neutralised with 6.5 g of soda and freed from 2,4-dimethyl phenol under reduced pressure up to a sump temperature of 140° C/12 Torr. This leaves a light, crystallising residue of 2230 g (93% of the theoretical). The recrystallisation of 100 g from 150 ml of tetrachloroethane gives α,α'-bis-(2-hydroxy-3,5-dimethyl phenyl-p-diisopropyl benzene in a yield of 80% (melting point 179° C).

1. distillationAt the same time, about 200 to 210 g of water distilled over
2. customfreed from 2,4-dimethyl phenol under reduced pressure up to a sump temperature of 140° C/12 Torr
3. customThis leaves a light
4. customcrystallising residue of 2230 g (93% of the theoretical)
5. customThe recrystallisation of 100 g from 150 ml of tetrachloroethane