Acetic Anhydride → HCID 13066702、化合物
反応式
CO[C:3]1[C:8]([O:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[CH3:16])=[CH:7][CH:6]=[CH:5][C:4]=1[CH2:17][C:18]([OH:20])=[O:19].C(OC(=O)C)(=O)C>I>[C:11]1([CH3:16])[CH:12]=[CH:13][CH:14]=[CH:15][C:10]=1[O:9][C:8]1[C:3]2[O:20][C:18](=[O:19])[CH2:17][C:4]=2[CH:5]=[CH:6][CH:7]=1参加物
4
反応条件
- 温度
- 100 °C
実験手順
2-[2-Methoxy-3-(o-tolyloxy)phenyl]acetic acid (34.0 g) was added to a mixture of acetic anhydride (50 ml) and 50% aqueous solution of hydrogen iodide (100 ml), and the mixture was refluxed under heating for an hour. The reaction mixture was poured into ice-water (1 l) and extracted with diethyl ether. The extract was washed with aqueous sodium hydrogen sulfite and water (twice) successively, dried over magnesium sulfate and then evaporated. The oily residue (34.0 g) was dissolved in acetic anhydride (50 ml), stirred at 100° C. for 1.5 hours and then evaporated. The crystalline residue (29.0 g) was recrystallized from methanol and diisopropyl ether successively to give colorless crystals of 7-(o-tolyloxy)-2,3-dihydrobenzofuran-2-one (22.0 g). mp 110°-111° C.