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

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After adding 2.5 ml of the mixture of formic acid and triethylamine prepared according to Example 1 to 2.94 g (0.01 mol) of 5-(3,4-dimethoxyphenylmethyl)-2,2-dimethyl-1,3-dioxane-4,6-dione (m.p.: 142°-144° C.), the reaction mixture was heated to 100° C. for 2 hours, then cooled down. After the addition of 25 ml of water the pH value was adjusted to 1 by adding concentrated hydrochloric acid, then the mixture was thoroughly shaken with 100 ml of chloroform. After separation the chloroform phase was evaporated under reduced pressure to give a white crystalline product.

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