Process for the oxidation of aromatic methyl groups

Details Process for the oxidation of aromatic methyl groups Process for the oxidation of aromatic methyl groups

C - Chemistry, Metallurgy

07

C

C07C 63/70 (2006.01) C07B 41/08 (2006.01) C07C 51/285 (2006.01)

Patent

CA 2138943

Fluoro-substituted aromatic carboxylic acids, and particular 2- and 4-fluorobenzoic acid can be made from the corre- sponding fluoro-methyl compound such as fluorotoluene in a single stage by reaction at elevated temperature, preferably of at least 80°C with hydrogen peroxide and bromide in mole ratios to the substrate of greater than 2:1, and preferably around 3:1, in the presence of means capable of generating bromine free radicals from bromine molecules, such as radiation having a wave- length of not greater than 600 nm or an organic peroxide.

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