Preparation of carboxylic acids and esters thereof

Details Preparation of carboxylic acids and esters thereof Preparation of carboxylic acids and esters thereof

C - Chemistry, Metallurgy

07

C

260/494.3, 260/5

C07C 53/122 (2006.01) C07C 51/353 (2006.01) C07C 53/126 (2006.01) C07C 69/24 (2006.01)

Patent

CA 1234145

ABSTRACT OF THE DISCLOSURE A carboxylic acid or an ester thereof having at least two carbon atoms more than formic acid is prepared by reacting at elevated temperature e.g. 100 to 250°C formic acid or a formate ester with an olefin e.g. ethylene in the presence of, as catalyst, a Group VIII noble metal e.g. iridium, preferably promoted by iodide, to cause addition of the formic acid or ester to the olefin and form the a higher acid e.g. propionic acid or ester thereof. A strong acid such as a sulphonic acid may be used as a copromoter. The catalyst is employed in solution.

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