Process for the preparation of...

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C - Chemistry, Metallurgy

07

D

C07D 213/643 (2006.01) C07D 213/73 (2006.01)

Patent

CA 2053803

(3-Fluoropyridin-2-yloxy)phenoxypropionic acids of formula I (See formula I) wherein X is hydrogen, fluoro, chloro, bromo or trifluoromethvl and Y is hydrogen, sodium or potassium, axe prepared by reacting a compound of formula 11 Image wherein X and Y are as defined for formula I, in an anhydrous medium, with hydrogen fluoride and a diazotising agent, and converting the diazonium fluoride so produced by thermal decomposition into the (3-fluoropyridin-2-yloxy)phenoxypropionic acid of formula I.

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