反应详情

31.5 ml of phosphorus oxychloride was added dropwise to 26.0 ml of DMF and stirring carried out for 1 hour. 25.0 g (223 mmol) of 3-ethylthiophene was added dropwise thereto and, after stirring for 1 hour, stirring was conducted at 100° C. for 1 hour. After cooling to room temperature, dilution was carried out with dichloromethane and the mixture poured into saturated bicarbonate of soda solution and neutralization performed with aqueous sodium hydroxide solution. Extraction was then carried out with dichloromethane, followed by drying and concentrating. The residue was distilled and 25.7 g (183 mmol, 0.1 mmHg, 48-49° C). of an approximately 3:1 mixture of 3-ethylthiophenealdehyde and 4-ethylthiophenealdehyde was obtained as a colourless liquid.

1. stirringafter stirring for 1 hour
2. stirringstirring
3. waitwas conducted at 100° C. for 1 hour
4. extractionExtraction
5. customby drying
6. concentrationconcentrating
7. distillationThe residue was distilled
8. custom25.7 g (183 mmol, 0.1 mmHg, 48-49° C)
9. additionof an approximately 3:1 mixture of 3-ethylthiophenealdehyde