4,5-Dimethoxyphthalic acid → 5,6-Dimethoxy-1,3-dihydro-2-benzofuran-1,3-dione

참여 물질

반응 단계

The product of above-mentioned (b) (4.1 g, 18 mmol) was heated under reflux in acetic anhydride (14 ml) for 10 minutes. The reaction solution was poured into ice-cold water, and extracted with chloroform. The organic layer was washed with an aqueous saturated sodium bicarbonate solution and then water, dried and concentrated under reduced pressure to give 1.8 g of the title compound.

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