Process for preparing diketone compounds and precursors thereto
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United States of America Patent
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Feb 25, 2003
Grant Date -
May 23, 2002
app pub date -
Nov 23, 2001
filing date -
Feb 1, 1996
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Abstract
A process for preparing compounds of the formula: ##STR1## wherein R.sub.2 is lower alkyl; or phenyl optionally substituted by from one to five groups, the same or different, which are lower alkyl, lower haloalkyl, halogen or --SR.sub.4 ; R.sub.3 is halogen, lower alkyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, --S-alkyl, cycloalkyl having from 3 to 7 carbon atoms in the ring, alkenyl or alkynyl having from 3 to 7 carbon atoms, or --(CR.sub.5 R.sub.6)--SR.sub.2 wherein q is one or two; R.sub.4 is lower alkyl; R.sub.5 and R.sub.6 independently represent hydrogen, lower alkyl or lower haloalkyl; and n is zero or an integer from one to three; intermediate compounds of the formula: ##STR2## and processes for preparing them.
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