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A mixture containing 8.7 g of 2,3-dichlorobenzaldehyde, 5.8 g of methyl acetoacetate, 28 drops of pyridine and 38 drops of hexanoic acid in 280 ml of benzene is brought to reflux with stirring for 4 hours. It is transferred to a separating funnel and washed with 10% strength sodium bicarbonate solution, then with N hydrochloric acid solution and then with water. The mixture is dried and evaporated. The crystals obtained are washed with isopropyl ether.

1. temperatureto reflux
2. customIt is transferred to a separating funnel
3. washwashed with 10% strength sodium bicarbonate solution
4. customThe mixture is dried
5. customevaporated
6. customThe crystals obtained
7. washare washed with isopropyl ether