Preparation of halogenovinyl-substituted tetra-hydrofuran-2-ones
AssigneeBayer Aktiengesellschaft
InventorsHans-Georg Heine, Armin Hubner, Willy Hartmann
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Abstract
Halogenovinyl-substituted tetrahydrofuran-2-ones of the formula ##STR1## are prepared by reacting a peracid such as peracetic, perpropionic or m-chloroperbenzoic acid with a halogenvinyl-substituted cyclobutanone of the formula ##STR2## in which R.sup.1 to R.sup.8 can be hydrogen, halogen, cyano or various organic radicals, or in pairs can make up a ring. Products wherein R.sup.3 is not hydrogen or R.sup.1 is not halogen are new. The products are useful as intermediates in making insecticides.
Claims11
A process for the preparation of a halogenovinyl-substituted tetrahydrofuran-2-one of the formula ##STR7## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.5 each independently is hydrogen, chlorine, bromine, fluorine, cyano, alkyl, alkenyl, cycloalkyl, aryl or aralkyl and
- R.sup.4, R.sup.6, R.sup.7 and R.sup.8 each independently is hydrogen, alkyl, alkenyl, cycloalkyl, aryl or cyano, or
- R.sup.5 and R.sup.6, and/or R.sup.4 and R.sup.5, and/or R.sup.4 and R.sup.6, and/or R.sup.7 and R.sup.8, with the atoms to which they are linked, form a ring, at least one of the radicals R.sup.1, R.sup.2 and R.sup.3 being fluorine, chlorine or bromine,
- comprising reacting a peracid with a halogenovinyl-substituted cyclobutanone of the formula ##STR8##
Dependencies are inferred from the claim text.