The resulting mixture was left stirring at room temperature for 24 h after which time it was acidified to pH 1 with 0.5 M HCl, and extracted with ethyl acetate (150 mL).
The resultingmixture was left stirring at room temperature for24 h after which time it was acidified to pH 1 with 0.5 MHCl, and extracted with ethyl acetate (150 mL).