Acetone → 6-Acetoxy-2-hydroxy-2,5,7,8-tetramethylchroman

Participants

Reaction Steps

To a solution of (± )-6-acetoxy-2-methoxy-2,5,7,8-tetramethylchroman in 2500 ml. of acetone was added 2000 ml. of H2O followed by 16.6 ml. of concentrated aqueous HCl. Solvent was distilled from the stirred mixture until the head temperature reached 90 degrees centrigrade. The suspension was cooled in an H2O bath to 50 degrees centigrade. At 70 degrees centigrade, 2000 ml. of acetone was added, giving a clear solution. The solution was seeded occasionally until crystallization began. After 3.5 hours, 1500 ml. of H2O was added and the suspension was cooled in an ice bath. The solid was removed by filtration, washed with H2O and dried at 50 degrees centigrade/0.1 mmHg. to give (± )-6-acetoxy-2-hydroxy-2,5,7,8-tetramethylchroman as a granular yellow-tan solid, sintering from 114 degrees centigrade, m.p. 127°-132 degrees centigrade.

Provenance & Evidence