- Preparation method of pyriproxyfen
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The invention relates to a preparation method of pyriproxyfen, which comprises the following steps: condensing 4-phenoxyphenol and propylene carbonate under the action of a catalytic amount of alkali to obtain 1-(4-phenoxyphenyl)-2-propanol PPP; and continuously condensing the obtained PPP with 2-chloropyridine to obtain pyriproxyfen. The method avoids the generation of the byproduct is-PPP in the original process, improves the product quality and yield, reduces the production cost, is simple and practical, and has a good industrial prospect.
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Paragraph 0027; 0031-0034; 0037; 0038
(2021/05/01)
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- COMPLEX CATALYST, PROCESS FOR PRODUCING THE COMPLEX CATALYST, AND PROCESS FOR PRODUCING ALCOHOL DERIVATIVE WITH THE COMPLEX CATALYST
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There are provided (asymmetric) complex catalysts comprising metal complexes and Lewis acids as components, the metal complex being of formula (1): wherein R1, R2, R3, R4, R5, R6, R7 and R8 are the same or different and are independently hydrogen, halogen, alkyl or the like; one of R9 and R10 is hydrogen and the other is alkyl of 1 to 4 carbon atoms or the like; Q is a single bond or alkylene of 1 to 4 carbon atoms; M is a metal ion; and A is a balancing counter ion or ligand; processes for the production of these complex catalysts; processes for the production of (optically active) alcohol derivatives, characterized in that cyclic ether compounds are reacted with phenol derivatives in the presence of these complex catalysts; and further processes for producing (optically active) nitrogen-containing heterocyclic compounds by reacting these alcohol derivatives with halogenated nitrogen-containing heterocyclic compounds in the presence of a base.
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- Method for exterminating termites
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A method for exterminating termites comprising using an entomopathogenic nematode together with an inset-growth regulator or a slow-acting insecticide, wherein insecticidal effects are reinforced compared with the cases using singly the entomopathogenic nematode and the insect-growth regulator or the slow-acting insecticide, respectively, and a bait station for exterminating termites that contains an entomopathogenic nematode with an insect-growth regulator or a slow-acting insecticide. According to the invention, emission of harmful chemicals to environment can be suppressed. The invention is nonpoisonous for human being and livestock, and is useful for indoor or outdoor extermination of termites.
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- Insecticidal combination to control mammal fleas, in particular fleas on cats and dogs
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Process and composition, in particular for controlling fleas on small mammals, characterized in that the composition includes, on the one hand, at least one insecticide of 1-N-arylpyrazole type, in particular fipronil, and, on the other hand, at least one compound of IGR (insect growth regulator) type, in doses and proportions which are parasiticidally effective on fleas, in a fluid vehicle which is acceptable for the animal and convenient for local application to the skin, preferably localized over a small surface area.
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- Insecticidal compositions and methods of use employing imidacloprid and another insecticide
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The present invention relates to insecticidal mixtures of chloronicotinyl insecticides of the formula (I) STR1 in which R1 represents C1 -C5 -alkyl, R2 represents hydrogen or C1 -C5 -alkyl, or R1 and R2 together represent --CH2 --CH2 --; --CH2 --CH2 --CH2 -- or STR2 X represents an NH group, NCH3 group or represents sulphur, Y represents nitrogen or a CH group and Z represents cyano or nitro, with one or more of the synergists mentioned in the description.
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