92880-79-0Relevant articles and documents
Production process of bifenthrin
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Paragraph 0028-0041, (2021/04/02)
The invention discloses a production process of bifenthrin. The production process comprises the following steps: mixing 2-methyl-3-phenyl benzyl alcohol and a catalyst, putting in a reaction vessel,increasing the temperature to 10-60 DEG C to a molten state, dropwise adding 3-(2-chlorine-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropane methyl halide under the condition of a certain negativepressure, absorbing negative-pressure tail gas by using tertiary water to obtain by-product acid; after the completion of dropwise adding, performing thermal-insulation reaction for 1-3 hours at a temperature of 10-60 DEG C, ending the reaction when the 2-methyl-3-phenyl benzyl alcohol is controlled to be less than 0.1 percent, performing product washing treatment, directly standing, layering andremoving water to obtain the bifenthrin. The production process disclosed by the invention has the beneficial effects that a solvent required for bifenthrin synthesis is cancelled, the subsequent treatment is simple, no re-crystallization treatment is required, by-product halogen acid is recovered, other three wastes are not generated, and the quality of the obtained bifenthrin is obviously improved. The production process disclosed by the invention has the advantages that the processes are simple, the product quality is high, the economy is improved through the by-product halogen acid, and the requirements for industrial clean production are met.
Enantiomeric separation of type I and type II pyrethroid insecticides with different chiral stationary phases by reversed-phase high-performance liquid chromatography
Zhang, Ping,Yu, Qian,He, Xiulong,Qian, Kun,Xiao, Wei,Xu, Zhifeng,Li, Tian,He, Lin
, p. 420 - 431 (2018/01/04)
The enantiomeric separation of type I (bifenthrin, BF) and type II (lambda-cyhalothrin, LCT) pyrethroid insecticides on Lux Cellulose-1, Lux Cellulose-3, and Chiralpak IC chiral columns was investigated by reversed-phase high-performance liquid chromatography. Methanol/water or acetonitrile/water was used as mobile phase at a flow rate of 0.8?mL/min. The effects of chiral stationary phase, mobile phase composition, column temperature, and thermodynamic parameters on enantiomer separation were carefully studied. Bifenthrin got a partial separation on Lux Cellulose-1 column and baseline separation on Lux Cellulose-3 column, while LCT enantiomers could be completely separated on both Lux Cellulose-1 and Lux Cellulose-3 columns. Chiralpak IC provided no separation ability for both BF and LCT. Retention factor (k) and selectivity factor (α) decreased with the column temperature increasing from 10°C to 40°C for both BF and LCT enantiomers. Thermodynamic parameters including ?H and ?S were also calculated, and the maximum Rs were not always obtained at lowest temperature. Furthermore, the quantitative analysis methods for BF and LCT enantiomers in soil and water were also established. Such results provide a new approach for pyrethroid separation under reversed-phase condition and contribute to environmental risk assessment of pyrethroids at enantiomer level.
Enantioselectivity in estrogenic potential and uptake of bifenthrin
Wang, Lumei,Liu, Weiping,Yang, Caixia,Pan, Zhiyan,Gan, Jianying,Xu, Chao,Zhao, Meirong,Schlenk, Daniel
, p. 6124 - 6128 (2008/02/12)
Despite the fact that the biological processes of chiral compounds are enantioselective, the endocrine disruption activity and uptake of chiral contaminants with respect to enantioselectivity has so far received limited research. In this study, the estrogenic potential and uptake of the enantiomers of a newer pyrethroid insecticide, bifenthrin (BF), were investigated. Significant differences in estrogenic potential were observed between the two enantiomers in the in vitro human breast carcinoma MCF-7 cell proliferation assay (i.e., the E-SCREEN assay) and the in vivo aquatic vertebrate vitellogenin enzyme-linked immunosorbent assay (ELISA). In the E-SCREEN assay, the relative proliferative effect ratios of 1S-cis-BF and 1R-cis-BF were 74.2% and 20.9%, respectively, and the relative proliferative potency ratios were 10% and 1%, respectively. The cell proliferation induced by the two BF enantiomers may be through the classical estrogen response pathway via the estrogen receptor (ER), as the proliferation induced by the enantiomers could be completely blocked when combined with 10-6 mol/L of the ER antagonist ICI 182,780. Measurement of vitellogenin induction in Japanese medaka (Oryzias latipes) showed that, at an exposure level of 10 ng/mL, the response to 1S-cis-BF was about 123 times greater than that to the R enantiomer. Significant selectivity also occurred in the uptake of BF enantiomers in the liver and other tissues of J. medaka. These results together suggest that assessment of the environmental safety of chiral insecticides should consider enantioselectivity in acute and chronic ecotoxicities such as endocrine disruption.
