Formaldehyde → Dimethyl alpha-hydroxymethyl-alpha-fluoromalonate

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The process according to the invention for preparing an α-fluoroacrylic acid ester is carried out in three stages. First dimethyl α-fluoromalonate is reacted with formaldehyde to give dimethyl a-hydroxymethyl-α-fluoromalonate, which is then hydrolyzed and the hydrolysis product is dicarboxylated and dehydrated, and finally the resulting α-fluoroacrylic acid is esterified with an alcohol of the formula (3).

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