反应详情

196.3 g of 2,4,6-triethyl-2,6-dimethyl-1,2,5,6-tetrahydropyrimidine were added dropwise to 300 ml of concentrated hydrochloric acid at 30° - 40° C, with stirring. When the addition was complete, the mixture was stirred for a further 4 - 5 hours and then neutralized with sodium carbonate and extracted with benzene. The resulting benzene solution was washed with, in turn, a 5% aqueous solution of sodium carbonate and water, and was then dried over potassium carbonate. After removal of benzene, the residue was distilled under reduced pressure, giving 72.4 g of 5-amino-5-methyl-3-heptanone (bp 46° - 48° C/2.5 mmHg).

1. additionWhen the addition
2. stirringthe mixture was stirred for a further 4 - 5 hours
3. extractionextracted with benzene
4. washThe resulting benzene solution was washed with, in turn
5. dry with materiala 5% aqueous solution of sodium carbonate and water, and was then dried over potassium carbonate
6. customAfter removal of benzene
7. distillationthe residue was distilled under reduced pressure