Transfluthrin 四氟苯菊酯

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四氟苯菊酯

CAS号: 118712-89-3
英文名称: Transfluthrin
化学名称:2,3,5,6-四氟苄基 (1R,3S)-3-(2,2-二氯乙烯基)-2,2-二甲基环丙烷羧酸酯;3-(2,2-dichloroethenyl)-2,2-dimethyl-cyclopropanecarboxylic acid (2,3,5,6-tetrafluorophenyl)methylester
其他名称:拜奥灵,四氟菊酯,NAK 4455
分子式:C15H11Cl2F4O2
分子量:370.15

理化性质:纯品为有轻微气味的无色晶体,熔点32℃。工业品为含有少量结晶物的棕红色稠粘液体,蒸汽压1.1×10-3Pa(20℃),比密度d201.38,不溶于水,能溶于大多数有机溶剂。水中溶解度0.057mg/l,甲苯、正己烷、二氯甲烷中溶解度200g/l.

毒性: 大鼠急性经口LD50>5000mg/kg,吸入LC50 >513mg/m3,鸟类急性LD50>2000mg/kg,鱼类LC50 (96h,mg /l)0.0007。未观测到致畸、致癌性。对鱼、虾、蜜蜂、家蚕等毒性高,使用时勿接近鱼塘、蜂场、桑园,以免污染上述场所。

作用特点及杀虫谱:该品杀虫广谱,能有效的防治卫生害虫和储藏害虫;对双翅目昆虫如蚊类有快速击倒作用,且对蟑螂、臭虫有很好的残留效果。可用于蚊香、气雾杀虫剂、电热片蚊香等多种制剂中。

剂型:1.3% 电热蚊香液,

生产方法:四氟苯菊酯合成主要是以2,3,5,6-四氟苄醇为原料,在甲苯作为溶剂的情况下与吡啶和二氯菊酰氯进行反应制得。其中四氟苄醇为关键的中间体,二氯菊酰氯则为多种拟除虫菊酯通用型中间体,国内山东大成农药化工股份有限公司等多家企业已经生产。

四氟苄醇合成主要有两条路线生产:一、采用四氟苯甲酸或者四氟苯甲醛为原料合成四氟苄醇,如欧洲专利介绍,以1,2,4,5-四氟苯与正丁基锂反应,然后与二氧化碳作用制备2,3,5,6-四氟苯甲酸,再利用LiAlH4还原制备2,3,5,6-四氟苄醇。该法过程相对比较简单,但是反应条件苛刻,原料来源比较困难;

日本和国内报道则采用2,3,5,6-四氯对苯二腈为原料合成四氟苄醇。具体过程以二甲基甲酰胺作为溶剂,四氯对苯二腈与无水氟化钾进行亲核取代反应,生成2,3,5,6-四氟苯腈;然后在80%浓硫酸存在下,四氟苯腈进行水解反应得到四氟对苯二甲酸;四氟对苯二甲醇在三丁胺和氢氧化钠存在下发生脱羧反应得到四氟苯甲酸;四氟苯甲酸在甲苯作为溶剂的情况下,与氯化亚砜发生酰氯化反应得到四氟苯甲酰氯,在四氢呋喃作为溶剂的情况下,四氟苯甲酰氯与硼氢化钠催化还原得到四氟苄醇。

目前国内江苏扬农化工股份有限公司和江苏激素研究所等能够生产四氟苄醇。

生产情况:该品种由拜耳公司开发生产。国内:江苏扬农化工集团有限公司;常州康泰化工有限公司;金唐化学工业集团公司;江西庆江化工实业有限公司;常州黄隆化工有限公司;南京盟兴化学有限公司

价格:95%原药价格250万元/吨(09.7)

其他:拜耳公司在中国的专利授权(CN88100834),在2008年2月11日到期;不存在知识产权。

 

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transfluthrin
Insecticide
IRAC 3; pyrethroid

  transfluthrin

NOMENCLATURE
Common name transfluthrin (BSI, pa E-ISO)
IUPAC name 2,3,5,6-tetrafluorobenzyl (1R,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
Roth: 2,3,5,6-tetrafluorobenzyl (1R)-trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
Chemical Abstracts name (1R-trans)-(2,3,5,6-tetrafluorophenyl)methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate
Other names benfluthrin* (rejected BSI name proposal) CAS RN [118712-89-3] EEC no. 405-060-5 Development codes NAK 4455

PHYSICAL CHEMISTRY
Composition Tech. is ³92%. Mol. wt. 371.2 M.f. C15H12Cl2F4O2 Form Colourless crystals. M.p. 32 ºC B.p. 135 ºC/0.1 mbar V.p. 4.0 ´ 10-1 mPa (20 ºC) KOW logP = 5.46 (20 ºC) Henry 2.60 Pa m3 mol-1 (calc.) S.g./density 1.5072 g/cm3 (23 ºC) Solubility In water 5.7 ´ 10-5 g/l (20 ºC). In organic solvents >200 g/l. Stability No decomposition after 5 h at 200 ºC. DT50 in pure water (25 ºC) >1 y (pH 5), >1 y (pH 7), 14 d (pH 9). Specific rotation [a]D29 +15.3?(c=0.5, CHCl3)

COMMERCIALISATION
Patents DE 2714042; DE 3705224 both to Bayer Manufacturers Bayer CropScience; Jiangsu Yangnong

APPLICATIONS
Biochemistry Effector on presynaptic voltage gate sodium channels in nerve membranes, causing knockdown effects in insects. Mode of action Insecticide active by inhalation and contact; also repellent. Uses Fast-acting insecticide against mosquitoes, flies, cockroaches and whitefly. Formulation types AL; FU; LV; MC; VP; XX; Spraying cans. Selected products: 'Baygon' (Bayer CropScience); 'Bayothrin' (Bayer CropScience)

ANALYSIS
Methods for the determination of residues are available from Bayer CropScience.

MAMMALIAN TOXICOLOGY
Oral Acute oral LD50 for male and female rats >5000, male mice 583, female mice 688, hens >5000 mg/kg. Skin and eye Acute percutaneous LD50 (24 h) for male and female rats >5000 mg/kg. Inhalation LC50 (4 h) for male and female rats >513 mg/m3 air. NOEL (24 mo) for male and female rats 20 ppm, for male and female mice 100 ppm. Toxicity class WHO (a.i.) U EC classification Xi; R38| N; R50, R53

ECOTOXICOLOGY
Birds Acute oral LD50 for Virginian tree quail (Colinus virginianus) and canary birds (Serinus canarius) >2000 mg/kg. Fish LC50 (96 h) for golden orfe 1.25, rainbow trout 0.7 mg/l. Daphnia LC50 (48 h) 0.0017 mg/l. Algae EC50 (96 h) for Scenedesmus subspicatus >0.1 mg/l.

ENVIRONMENTAL FATE
Animals Tetrafluorobenzoic acid and the glucuronate of tetrafluorobenzyl alcohol are formed. Soil/Environment In aquatic ecosystems, tetrafluorobenzyl alcohol and tetrafluorobenzoic acid are formed. DT50 in water 2 d (in light), 8 d (in dark).