Abstract
Higher homologous acids of chrysanthemic acid described in the previous papers were esterified with (±)-allethrolone. The toxicity of these esters and the related compounds were evaluated by the topical application method to Musca domestica vicina Macq. The allethronyl homochry-santhemate (entry Nos. 4, 5) was shown to be toxic and the dextrorotatory form was far more toxic than the laevorotatory one. Further elongation of the ester linkage resulted in a loss of toxicity. The cyclobutane carboxylic acid ester (entry No. 10) was shown to be toxic and so, the cyclopropane ring might be replaced to some extent by the cyclobutane ring, provided the other requirements were fulfiled. However, further elongation of the ester linkage also reduced the toxicity. The lactones (entry Nos. 12–16) obtained by the hot sulfuric acid treatment were non-toxic.
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