Preparation of higher alkyl esters of carboxylic acids

Details Preparation of higher alkyl esters of carboxylic acids Preparation of higher alkyl esters of carboxylic acids

C - Chemistry, Metallurgy

07

D

C07D 213/73 (2006.01)

Patent

CA 2036017

Larger (C6-C12) esters of substituted 2-pyridinyloxyalkanoic acids, such as 1-methylheptyl (4-amino-3,5-dichloro-6-fluoro-2-pyridinyloxy)acetate, are prepared in high yield and purity by first preparing the methyl or ethyl ester and then transesterifying with a C6-C12 alcohol. The methyl or ethyl ester can be prepared by alkylation of an alkali metal salt of 4-amino-3,5-dichloro-6-fluoro-2-pyridinol with methyl or ethyl chloroacetate and the transesterification can be carried out in the presence or a tetraalkyl titanate catalyst.

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