反应详情

温度

174 fahrenheit

50 g of isophthalic acid is refluxed at 165° C. (329° F.) for 18 hr in 150 mL of 2-amino-1-propanol. The bulk of the excess amino alcohol is then distilled off and the remaining viscous liquid dissolved in 200 mL of 2% NaOH. The resulting bis-N-(1-methyl-2-hydroxyethyl)isophthalamide is then precipitated in acetone, filtered and dried. To 10 g of the aforementioned diamide is slowly added 300 mL of thionyl chloride with stirring. The mixture is then heated to reflux (79° C., 174° F.) for approximately 1 hour, after which time the homogenous yellow solution is cooled and poured into diethylether to precipitate the 4,4'-dimethyl-2,2'-(1,3-phenylene)bis(oxazoline) hydrochloride salt. The salt is neutralized using 20% NaOH and the free base extracted into ether. The organic phase is then dried and evaporated to give 4,4'-dimethyl-2,2'-(1,3-phenylene)bis(oxazoline).

1. distillationThe bulk of the excess amino alcohol is then distilled off
2. dissolutionthe remaining viscous liquid dissolved in 200 mL of 2% NaOH
3. customThe resulting bis-N-(1-methyl-2-hydroxyethyl)isophthalamide is then precipitated in acetone
4. filtrationfiltered
5. customdried
6. temperatureThe mixture is then heated
7. temperatureafter which time the homogenous yellow solution is cooled
8. additionpoured into diethylether
9. customto precipitate the 4,4'-dimethyl-2,2'-(1,3-phenylene)bis(oxazoline) hydrochloride salt
10. extractionthe free base extracted into ether
11. customThe organic phase is then dried
12. customevaporated