Benazolin

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Benazolin

中文通用名

草除灵

IUPAC

4-chloro-2-oxobenzothiazolin-3-ylacetic acid; 4-chloro-2,3-dihydro-2-oxobenzothiazol-3-ylacetic acid

CAS

4-chloro-2-oxo-3(2H)-benzothiazoleacetic acid

CAS No.

[3813-05-6]

Molecular Formula

C₉H₆ClNO₃S

Molecular Structure

General Product Information

Category

Herbicides > Benzothiazole herbicides

Activity

Herbicide

Physical & Safety Data

Physical Properties

Molecular weight:243.7; Physical form:Colourless, odourless crystals. Composition:Tech. grade is c. 90% pure. Melting point:193 °C; (, 189 °C); Vapour pressure:1 × 10-4 (20 °C); Henry constant:4.87 ×10-8 Pa m3 mol-1 (); Partition coefficient(n-octanol and water):logP = 1.34 (20 °C); pKa:3.04 (20 °C); Solubility:In water 500 /l ( 2.94, 20 °C). In acetone 100-120, ethanol 30-38, ethyl acetate 21-25, isopropanol 25-30, dichloromethane 3.7, toluene 0.58, p-xylene 0.49, hexane <0.002 (all in g/l, 20 °C).; Stability:Stable in neutral, acidic, and weakly alkaline media. Decomposed by concentrated alkalis.;

Toxicology

Oral:Acute oral 50 for rats >5000, mice >4000 /. Percutaneous:Acute percutaneous 50 for rats >5000 /kg. Mild skin and eye irritant (rabbits). Not a skin sensitiser. Inhalation:50 (4 h) for rats 1.43 g/m³ air. Phytotoxicity:Selective in cereals, oilseed rape, soya beans, maize, grassland.

Environmental Profile

Ecotoxicology:
Bees:Non-toxic. 50 480 mg/bee.Birds:Acute oral 50 for Japanese quail >10 200 /.Daphnia:Low toxicity; 50 (48 h) 233.4 /l (measured); 353.6 /l (nominal).Fish:50 (96 h) for trout 31.3, bluegill sunfish 27 /l.

Environmental fate:
Animals:In urine, major metabolites are N-[2-chloro-6-(methylsulfinyl)phenyl]glycine and N-[N-[2-chloro-6-(methylthio)phenyl]glycinyl]aniline. There are also small amounts of other acid-labile polar conjugates of benazolin acid, and 50 c. 14-28 d. d 1.0 (sandy loam), 0.4 (loam).Plant:Benazolin acid is metabolised to form acid-labile conjugates. Minor pathways include hydroxylation of the aromatic ring of benazolin acid and loss of the acetic acid side-chain, followed by conjugation. Benazolin acid is translocated more rapidly and to a

Transport Information

Hazard Class:III(Slightly hazardous)