反应详情

Magnesium metal (1.2 g) was added to 2 ml of tetrahydrofuran. With stirring at room temperature, 20 ml of a solution of 2.0 g of 3-bromobenzaldehyde dimethyl acetal in a 1:1 mixture of tetrahydrofuran and ethyl ether was added dropwise over the course of 1 hour. With stirring under ice cooling, 15 ml of a tetrahydrofuran solution of 2.25 g of 3-methyl-2-butenyl bromide was added to the resulting solution. The temperature of the mixture was returned to room temperature, and then it was stirred for 1 hour. A saturated aqueous solution of ammonium chloride was added to the reaction mixture to terminate the reaction. Ethyl ether was added, and the reaction mixture was treated in a customary manner to give 1.71 g (yield 90%) of 3-(3-methyl-2-butenyl)benzaldehyde dimethyl acetal as a colorless oil.

1. additionwas added dropwise over the course of 1 hour
2. stirringWith stirring under ice cooling
3. customwas returned to room temperature
4. stirringit was stirred for 1 hour
5. customto terminate
6. customthe reaction
7. additionthe reaction mixture was treated in a customary manner