反应详情

温度

80 °C

To a mixture of crotonic aldehyde (165.2 g, 2.36 mol), 2-methyl-penta-1,3-diene (361.6 g, 4.41 mol) and formalin (37% in water (200 g, 2.46 mol) was added a mixture of pyrrolidine (16.0 g, 0.22 mol) and propionic acid (17.0 g, 0.23 mol). The mixture was placed in an autoclave and heated to 60-100° C. for 8 h. The reaction mixture was cooled to room temperature, diluted with sat. NaHCO3 and extracted 3 times with MTBE (200 ml). The combined org. layers were washed with brine (200 ml), dried (MgSO4) and evaporated in vacuo. The residue was purified by distillation to give 2,4-dimethyl-1-vinylcyclohex-3-enecarbaldehyde (50% yield). Boiling point: 50-53° C./0.15 mbar.

1. additionwas added
2. temperatureThe reaction mixture was cooled to room temperature
3. extractionextracted 3 times with MTBE (200 ml)
4. washlayers were washed with brine (200 ml)
5. dry with materialdried (MgSO4)
6. customevaporated in vacuo
7. distillationThe residue was purified by distillation