New insecticides are of formula: ##STR1## wherein R.sup.1 represents hydrogen or a methyl group; R.sup.2 represents hydrogen or a halogeno or lower alkyl group; R.sup.3 represents hydrogen or a halogeno or carbo(lower alkoxy) group which contains at least 2 carbon atoms in the lower alkoxy residue when R.sup.2 represents methyl; with the proviso that (a) R.sup.2 and R.sup.3 each represent hydrogen only when R.sup.1 represents methyl, (b) when R.sup.1 and R.sup.3 each represent hydrogen and R.sup.2 represents alkyl, that alkyl group contains at least 2 carbon atoms and (c) when R.sup.3 represents halogeno, R.sup.2 represents hydrogen or halogeno; and R represents a group which forms insecticidal esters with chrysanthemic acid e.g. 5-benzyl-3-furylmethyl, 3-phenoxybenzyl, .alpha.-cyano-3-phenoxybenzyl. The esters are prepared by forming the ester linkage conventionally or by a Wittig reaction using a 3-formyl- or 3-acetyl-2,2-dimethyl cyclopropane carboxylic acid esterified with the desired residue or by an alkyl group which is subsequently converted to the desired residue.
新的
杀虫剂的
化学式为:##STR1## 其中,R.sup.1代表氢或甲基基团;R.sup.2代表氢或卤代或低碳基基团;R.sup.3代表氢或卤代或含有至少2个碳原子的碳基(低碳基氧)基团,当R.sup.2代表甲基时;但必须满足以下条件:(a)当R.sup.1代表甲基时,R.sup.2和R.sup.3均代表氢;(b)当R.sup.1和R.sup.3均代表氢,R.sup.2代表烷基时,该烷基含有至少2个碳原子;(c)当R.sup.3代表卤代时,R.sup.2代表氢或卤代;R代表一种与菊花酸形成杀虫酯的基团,例如5-苄基-3-
呋喃甲基、3-苯氧基苄基、α-
氰基-3-苯氧基苄基。这些酯可以通过常规的酯键形成或使用3-甲酰基-或
3-乙酰基-2,2-二甲基环丙烷羧酸酯化所需残基的Wittig反应来制备,或通过随后转化为所需残基的烷基来制备。