Intermediates for pyrazolyl acetic acid derivatives
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United States of America Patent
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Sep 22, 1998
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N/A
app pub date -
Nov 1, 1996
filing date -
Sep 7, 1994
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Expired
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Abstract
The invention discloses a novel process for the preparation of a compound of formula II ##STR1## wherein R.sub.1 is C.sub.1-5 alkyl, R.sub.2 is hydrogen or C.sub.1-5 alkyl, and R.sub.3 is optionally substituted phenyl, comprising the reaction of a 4-hydroxypyrazole of formula III ##STR2## wherein R.sub.1 and R.sub.2 are as defined for formula II, with a benzylhalide of formula IV Hal--CH.sub.2 --R.sub.3 (IV) wherein Hal is halogen, preferably bromine or chlorine, and R.sub.3 is as defined for formula II, in the presence of a base. The invention further comprises a novel process for the preparation of the 4-hydroxypyrazole of formula III. The compounds of formulae II and III are intermediates for highly effective systemic fungicides of the class of pyrazolyl acetic acid derivatives.
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