Preparation of higher alkylesters of carboxylic acids

Details Preparation of higher alkylesters of carboxylic acids Preparation of higher alkylesters of carboxylic acids

1991-07-02

1993-05-25

Rotman, Alan L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546301, 546330, C07D21373, C07D21363

Patent

active

052141500

ABSTRACT:
Larger (C.sub.6 -C.sub.12) 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 C.sub.6 -C.sub.12 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 of a tetraalkyl titanate catalyst.

REFERENCES:
patent: 3755339 (1973-08-01), McKendry
patent: 3969360 (1976-07-01), Freedman
patent: 4108629 (1978-08-01), McKendry
patent: 4487933 (1984-12-01), Mixan
patent: 4542221 (1985-09-01), Jones
patent: 4701531 (1987-10-01), Adaway

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