反应详情

To a solution of 6.09 g. of (±) -6-benzyloxy-2,5,7,8-tetramethylchroman-2-acetaldehyde in 280 ml. of ethanol was added a solution of 3.57 g. of silver nitrate in 42 ml. of H2O followed, dropwise over 0.5 hour, by a solution of 3.49 g. of sodium hydroxide in 100 ml. of H2O. The mixture was stirred at 23° for 2.0 hours, filtered, concentrated in vacuo, diluted with H2O, and extracted with ether. The aqueous solution was acidified with 1 N HCl and again extracted with ether. These latter extracts were washed with brine, dried over magnesium sulfate and stripped of solvents to give (±)-6-benzyloxy-2,5,7,8-tetramethylchroman2-acetic acid.

1. filtrationfiltered
2. concentrationconcentrated in vacuo
3. additiondiluted with H2O
4. extractionextracted with ether
5. extractionagain extracted with ether
6. washThese latter extracts were washed with brine
7. dry with materialdried over magnesium sulfate