Hydrochloric Acid → HCID 15729800, compound

Participants

Reaction Steps

A mixture of 6.5 g of the 7-(4-nitrophenoxy)-2,4,4-trimethyl-4H-1-benzopyran, 26 ml of water, 13 ml of conc. hydrochloric acid and 65 ml of acetone was refluxed for 2 hours. An 10% aqueous solution of sodium hydroxide was added to the reaction mixture to neutralize it, and then 100 ml of water and 200 ml of ethyl acetate were added, and the mixture was subjected to oil-water separation. The oil layer was washed with 50 ml of brine, dried over magnesium sulfate and concentrated. Toluene (5 ml) and 45 ml of hexane was added to the residue, and the precipitated crystals were collected by filtration, washed with 50 ml of hexane and dried to give 5.1 g (yield 70%) of a pale brown powder (mp. 159°-160° C., recrystallized from ethanol).

Provenance & Evidence