5-halo-4-fluoro-4,7,7-trimethyl-3-oxabicyclo[4.1.0]heptan-2-ones, process for their preparation and their use for preparing cyclopropanecarboxylic acids
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United States of America Patent
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Dec 24, 2002
Grant Date -
Apr 18, 2002
app pub date -
Oct 17, 2001
filing date -
Nov 10, 1999
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Expired
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Abstract
5-Halo-4-fluoro-4,7,7-trimethyl-3-oxabicyclo[4.1.0]heptan-2-ones, process for their preparation and their use for preparing cyclopropanecarboxylic acids Compounds of the formula (I), ##STR1## in which Hal is Cl, Br or I, are suitable for use as intermediates in the preparation of pyrethroids.
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