Phosphorus oxychloride → 4-Chloro-2,5-dimethyl-6-(2,4,6-trimethyl-benzyl)pyrimidine
Reaction equation
O[C:2]1[C:7]([CH3:8])=[C:6]([CH2:9][C:10]2[C:15]([CH3:16])=[CH:14][C:13]([CH3:17])=[CH:12][C:11]=2[CH3:18])[N:5]=[C:4]([CH3:19])[N:3]=1.O=P(Cl)(Cl)[Cl:22]>>[Cl:22][C:2]1[C:7]([CH3:8])=[C:6]([CH2:9][C:10]2[C:15]([CH3:16])=[CH:14][C:13]([CH3:17])=[CH:12][C:11]=2[CH3:18])[N:5]=[C:4]([CH3:19])[N:3]=1Participants
3
Procedure
A mixture of 4-hydroxy-2,5-dimethyl-6-(2,4,6-trimethyl-benzyl)-pyrimidine (1.2 g, 4.68 mmol) and POCl3 (25 ml) was heated at reflux for 1 hour. The mixture was cooled and evaporated to dryness. The residue was poured into ice-water and extracted with ethyl acetate. The organic layer was washed with brine, dried and concentrated to dryness to give 1.24 g (97%) of golden crystals, mp 82–84° C.
Workup
- temperaturewas heated
- temperatureat reflux for 1 hour