Cypermethrin is highly toxic to fish, the LC50 (96 hours) for rainbow trout is 0.00015mg/L, and the LC50 (48 hours) for Daphnia is 0.00016mg/L. However, because the agent has a high affinity in the soil and its water solubility is low, the actual impact is relatively small. This agent is moderately toxic to bees and highly toxic to silkworms. High insecticidal activity, mainly contact and stomach poisoning, no systemic and fumigating activity. Its action is rapid, the duration of effect is long, and the insecticidal spectrum is wide.

Toxicity and effect of cypermethrin:

Cypermethrin is highly toxic to fish, the LC50 (96 hours) for rainbow trout is 0.00015mg/L, and the LC50 (48 hours) for Daphnia is 0.00016mg/L. However, because the agent has a high affinity in the soil and its water solubility is low, the actual impact is relatively small. This agent is moderately toxic to bees and highly toxic to silkworms. High insecticidal activity, mainly contact and stomach poisoning, no systemic and fumigating activity. Its action is rapid, the duration of effect is long, and the insecticidal spectrum is wide.
Uses: Control cotton bollworm, cotton red spider, peach small borer, pear small borer, hawthorn spider mite, citrus red spider, yellow-spotted bug, tea-winged bug, cabbage aphid, cabbage caterpillar, diamondback moth, eggplant red spider, tea fine moth More than 20 kinds of pests, such as greenhouse whitefly, tea looper, tea caterpillar.

It is one of the new pyrethroid agricultural insecticides developed rapidly in the 1970s and 1980s, and is widely used in countries all over the world.

Preparation method one:

2-phenylbenzoyl chloride is obtained by reacting 2-phenylbenzoic acid with SOCl2, and then reacted with dimethylformamide to obtain the corresponding 2-phenylbenzamide, which is then reduced by lithium aluminum hydride to obtain 2-benzene Dimethylbenzylamine. React 2-phenylxylbenzylamine with CH3I to obtain the corresponding ammonium salt, and react with ethyl chloroformate after isomerization to obtain 2-methyl-3-phenylbenzyl chloride. Finally, with the corresponding acid in the presence of KOH, reflux in acetonitrile for 16h to obtain bifenthrin.

Preparation method two:

By 3,3-dimethyl-1-enepentanoic acid 2-methyl-3-phenyl bromide benzyl through condensation, ring closure, dehydrochlorination in the system.

This product has the characteristics of strong knockdown effect, broad spectrum, high efficiency, rapidity, long residual effect, etc. It mainly has contact killing effect and stomach poisoning effect, and has no systemic effect.

Preparation method three:

Put kung fu acid into the acid chloride kettle, add thionyl dropwise to generate kung fu acid chloride. Then add o-methylbiphenyl methanol, toluene, NaOH solution, water, etc. into the condensation reaction kettle. Coxyl chloride was added dropwise, and washed with water after the reaction was complete. Finally, the finished product is obtained by distillation, solvent removal, refining and purification and drying.