苄草唑

苄草唑用途

吡唑类除草剂，通过抑制叶绿素生物合成使杂草致死。防除稻田中一年生和多年生杂草。对稻、稗具有选择性，能在野稗、鸭舌草、节节菜及牛毛毡、萤蔺、窄叶泽泻等幼苗期通过其根部的吸收而抑制它们的生长，起到防除杂草的作用。本品能与多种除草剂混用，并肯增效作用，能起到单独使用所起不到的作用与效果。如与杀草隆、抑草磷及丁草胺等混用。一般在播前或移栽时用于稻田，每公顷有效成分3kg，施药时需在保水条件下，用手或机械均匀撒施10%颗粒剂。
 

苄草唑名称

[ CAS 号 ]:
58011-68-0

[ 中文名 ]:
吡唑特

[ 英文名 ]:
pyrazolate

[中文别名 ]:

[英文别名 ]:

苄草唑物理化学性质

[ 密度 ]:
1.42g/cm3

[ 沸点 ]:
610.7ºC at 760 mmHg

[ 分子式 ]:
C19H16Cl2N2O4S

[ 分子量 ]:
439.31200

[ 闪点 ]:
323.1ºC

[ 精确质量 ]:
438.02100

[ PSA ]:
86.64000

[ LogP ]:
5.42320

[ 蒸汽压 ]:
7.44E-15mmHg at 25°C

[ 折射率 ]:
1.632

[ 储存条件 ]:
0-6°C

苄草唑毒性和生态

CHEMICAL IDENTIFICATION

RTECS NUMBER :
PC4950050
CHEMICAL NAME :
Methanone, (2,4-dichlorophenyl)(1,3-dimethyl-5-(((4-methylphenyl )sulfonyl)oxy)-1H-pyr azol-4- yl)-
CAS REGISTRY NUMBER :
58011-68-0
BEILSTEIN REFERENCE NO. :
0860937
LAST UPDATED :
199612
DATA ITEMS CITED :
8
MOLECULAR FORMULA :
C19-H16-Cl2-N2-O4-S
MOLECULAR WEIGHT :
439.33
WISWESSER LINE NOTATION :
T5NNJ A1 C1 DVR BG DG& EOSWR D1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
9550 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Administration onto the skin
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
>5 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
1950 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
>6 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
>5 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Administration onto the skin
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
>5 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
3681 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
>8300 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
SKKNAJ Sankyo Kenkyusho Nempo. Annual Report of Sankyo Research Laboratories. (Sankyo K.K. Sogo Kenkyusho, 1-2-58 Hiro-machi, Shinagawa-ku, Tokyo 140, Japan) No.15- 1963- Volume(issue)/page/year: 36,44,1984

苄草唑安全信息

[ 符号 ]:

GHS07

[ 信号词 ]:
Warning

[ 危害声明 ]:
H332

[ 危害码 (欧洲) ]:
Xi

[ 风险声明 (欧洲) ]:
R36/37/38:Irritating to eyes, respiratory system and skin .

[ 安全声明 (欧洲) ]:
26-36/37/39-45

[ 危险品运输编码 ]:
NONH for all modes of transport

[ WGK德国 ]:
3

[ RTECS号 ]:
TA1841000

苄草唑制备

由1，3-二甲基吡唑酮-5与2，4-二氯苯甲酰氯在溶剂和碱存在下制得1，3-二甲基-4-（2，4-二氯代苯甲酰基）-5-羟基吡唑（以下称中间体），再与对甲苯磺酰氯缩合制得吡唑特。操作过程：将164mL叔丁醇、6g中间体和10.4g无水碳酸钾，回流1h，然后在回流状态下使补加的叔丁醇与水带出的叔丁醇速度相等，2h后，于15min内把11.5g对甲苯磺酰氯加完，继续回流1.5h。然后冷却至室温，抽滤，将滤饼与滤液除去溶剂后的残留物合并，用200mL苯和100mL水的混合液洗涤两次，分出苯层用150mL水洗涤两次，苯层用无水硫酸钠干燥，脱苯后得淡黄色粗品，用苯-己烷（1：1）溶液重结晶后得纯品。
文献报道，5-吡唑啉酮与2，4-二氯苯甲酰氯几乎定量反应，在有碱存在时可促进HCl的游离，加快反应速度，5-苯甲酰氧吡唑与5-吡唑啉酮的阴离子进行反应，生成目的物DTP的阴离子物。反应中，5-吡唑啉酮不断游离。存在少量的-5-吡唑啉酮阴离子有利于反应进行。实际上，在碱金属的碳酸盐的存在下，加热苯甲酰氧吡唑得到高收率的DTP盐，该金属盐亦可用苯甲酰化的化合物以同一反应获得。然而使用碱金属的碳酸盐不会产生副产物苯甲酸，使用等摩尔量的原料可生成目的化合物。生成的DTP盐继续进行甲苯磺酰化，得吡唑特。

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