| 摘要 |
Novel trihalomethylhydroxylactones of the general formula <IMAGE> in which X1, X2 and X3 in each case denote a fluorine, chlorine or bromine atom and the tautomeric cis-keto acids are valuable intermediates for the preparation of cis-2-(2,2-dihalovinyl)-3,3-dimethylcyclopropanecarboxylic acids which are key compounds in the preparation of pyrethroid insecticides.
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