Acetic Anhydride → HCID 13031642, compound
Reaction equation
[CH3:1][CH:2]1[C:7](=[O:8])[CH:6]=[CH:5][CH:4]([OH:9])[O:3]1.[C:10](OC(=O)C)(=[O:12])[CH3:11]>N1C=CC=CC=1>[CH3:1][CH:2]1[C:7](=[O:8])[CH:6]=[CH:5][CH:4]([O:9][C:10](=[O:12])[CH3:11])[O:3]1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A 12.8 g quantity of 2-methyl-6-hydroxy-3-oxo-3,6-dihydro-2H-pyran and 25 ml of acetic anhydride are reacted in the presence of 12.5 ml of pyridine with stirring at room temperature for 4 hours. After the reaction, the mixture is concentrated, the residue is poured into ice water, and the mixture is extracted with 100 ml of ether. The ethereal layer is washed with an aqueous solution of sodium carbonate and then dried over magnesium sulfate. After removing the magnesium sulfate, the ethereal layer is concentrated, and the residue is distilled at a reduced pressure of 0.4 mm Hg to give 12.6 g of 2-methyl-6-acetoxy-3-oxo-3,6-dihydro-2H-pyran as a colorless liquid fraction at 80° to 83° C in a yield of 80%.