Fluorine-containing pesticides are promising

Due to the special structure of fluorine atoms, good characteristics are exhibited in fields such as pesticides. According to incomplete statistics, among the 86 chemical pesticides newly developed in the world in the past 10 years, there are as many as 34 fluorine-containing compounds. Fluorine-containing pesticides have become the main body of high-end varieties and new pesticides. Many fluorine-containing pesticides have good application prospects and high added value. It is particularly worth mentioning that some important fluorochemical pesticides are shortly or soon expired. The following is a brief introduction of some of the fluorochemical pesticides that are worth promoting.

Divided by the trade name of chlorfenac, domestic patents expired in 2008 and annual sales exceeded 100 million U.S. dollars. As a novel azole-type broad-spectrum insecticidal acaricide, it can control a variety of lepidopteran, dipteran, coleopteran, hemipteran pests, and terpenes, and can effectively control esters, organic phosphorus Antifungal and pyrethroid insecticides produce resistant insects. The domestic dragon light chemical and Guangdong Deli Biotechnology Company registered the production of the original drug. Its intermediate is 2-(p-chlorophenyl)-5-(trifluoromethyl)pyrrole-3-carbonitrile, and domestically has mature industrial technology.

Tetrafluthrin is a trade name called Ao Ling, and domestic patents expire in 2008. It is a highly effective, low-toxic pyrethroid insecticide for sanitary use. It has inhalation, contact and repellent activity and is used as a raw material for a variety of mosquito coils and mosquito repellent films. It can also effectively control flies, cockroaches and whitefly. Is the current mainstream foreign health insecticide species, the current domestic market price is about 600,000 yuan / ton. There are fewer producers of tetrafluthrin, mainly because its intermediate tetrafluorobenzyl alcohol is difficult to synthesize. The synthesis route that is more in line with national conditions is that tetrafluorobenzonitrile is hydrolyzed and decarboxylated to get tetrafluorobenzoic acid. Post-reduction gives tetrafluorobenzyl alcohol.

The name of the cyhalofop-butyl fluorinate is Qianjin, and there is no Chinese patent. The domestic administrative protection expires in 2007 and a new phenoxy carboxylic acid herbicide developed by Dow AgroSciences. It is one of the most popular rice herbicides in China and has become one of the most popular varieties registered in China in recent years.

The name of tiaflusor methyl ester, Baosui, domestic administrative protection expires in 2010, can prevent and cure a variety of plant diseases, especially the fungal disease caused by bacillus mycelia. It is an excellent bactericide for the prevention and control of various crop diseases such as rice, peanut, cotton, sugar beet, potato and lawn. The intermediate required for the synthesis of fluoxetine is p-trifluoromethoxyaniline, which can also synthesize the insecticide of indoxagra, a heavy-weight insecticide that expires at the end of 2011.

Flunaxacin, trade name Volare or R6Albis, is a novel amide systemic fungicide. It was first approved in China in 2005. It is used to prevent potato late blight, and its most striking feature is its very safe crops. It is particularly suitable for comprehensive pest management systems. In recent years, global sales have grown rapidly and it has become an attractive new type of bactericide. The desired intermediate for the synthesis is 23-dichloro-5-trifluoromethyl pyridine, which is a common intermediate of many fluorochemical pesticides, such as haloxyfop-p-methyl, thiflum, tiflumuron, and impyridone. Domestic patent just expired insecticide fluazinam.