Process for the preparation of carboxylic acids and derivatives of them
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United States of America Patent
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Sep 27, 1994
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N/A
app pub date -
Oct 29, 1993
filing date -
Jul 17, 1992
priority date (Note) -
Expired
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Abstract
The subject matter of the invention is a process for the preparation of carboxylic acids and derivatives of them of the general formula ##STR1## wherein R means hydrogen, or a C.sub.1-4 alkyl or a (C.sub.1-5 alkoxy)carbonyl group, R.sub.1 is as defined in claim 1, R.sub.7 stands for hydrogen or a C.sub.1-7 alkyl group and R.sub.8 means hydrogen or a carboxyl group, by reacting a 1,3-dioxane-4,6-dione derivative of the general formula ##STR2## wherein R.sub.9 stands for a C.sub.1-4 alkyl group or a phenyl group, optionally monosubstituted by halogen and R.sub.10 stands for hydrogen or a C.sub.1-5 alkyl group or R.sub.9 and R.sub.10 together form a pentamethylene group, and an aldehyde or ketone of the general formula ##STR3## in the presence of formic acid.
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