Formic Acid → 3-(3,4-Dimethoxyphenyl)propionic acid

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After weighing 7.2 g (0.05 mol) of Meldrum's acid and 8.3 g (0.05 mol) of veratraldehyde to 50 ml of the mixture of formic acid and triethylamine prepared according to Example 1, the reaction mixture was heated to 100° C. during 1 hour and maintained at the same temperature for further 1 hour. Then the excess of formic acid and triethylamine was distilled off under reduced pressure of 2 kPa to give a distillate of 40 ml volume. The distillation residue was dissolved in 100 ml of chloroform and extracted with 50 ml of 1N sodium hydroxide solution. The chloroform phase was extracted with 2×100 ml of 1N sodium hydroxide solution. Thereafter Example 1 was followed to give a yield of 8.6 g (81.8%), m.p.: 96°-97° C.

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