反应详情

A mixture of 1,4-diethoxybenzene (24.9 g 0.150 mole) and 1,1-dichloromethyl methyl ether (18 g., 0.157 mole) in methylene chloride (80 ml.) was added with stirring during 20 minutes to a solution of stannic chloride (39 g., 0.150 mole) in methylene chloride (150 ml.) at approximately 0° C. The solution was then stirred at this temperature for 5 minutes and quenched by addition of aqueous hydrochloric acid (6 N., 100 ml.) which was added rapidly. The organic phase was separated washed with saturated aqueous sodium bicarbonate, dried over anhydrous magnesium sulfate, filtered, and the solvent removed from the filtrate by evaporation under reduced pressure to yield a crystalline solid (29 g.) m.p. 57°-59° C. Recrystallation (from ether) gave 2,5-Diethoxybenzaldehyde (27.1 g., 0.138 mole, 93%) m.p. 60°-61° I.R.: 1738 cm-1 (aldehyde CO).

1. additionwas added
2. customquenched by addition of aqueous hydrochloric acid (6 N., 100 ml.) which
3. additionwas added rapidly
4. customThe organic phase was separated
5. washwashed with saturated aqueous sodium bicarbonate
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. customthe solvent removed from the filtrate by evaporation under reduced pressure
9. customto yield a crystalline solid (29 g.) m.p. 57°-59° C