Mefenpyr-diethyl Common
Name: Mefenpyr-diethyl
Chemical Name:
¡¡diethyl 1-(2,4-dichlorophenyl)-4,5-dihydro-5-methyl-1H-pyrazole
¡¡diethyl (RS)-1-(2,4-dichlorophenyl)-5-methyl-2-pyrazoline-3,5-dicarboxylate(IUPAC)
Chemical Structure:
¡¡¡¡
CAS NO.:135590-91-9
Specification£º 95% min
¡¡¡¡¡¡Mol. wt. 373.2 M.f. C16H18Cl2N2O4
¡¡¡¡¡¡Form White to light beige crystals . M.p. 50-52¡æ V.p. 6.3¡Á10£3
mPa (20¡æ) ,1.4¡Á10£2 mPa (25¡æ) KowlogP= 3.83(pH
6.3, 21¡æ) S.g./density c. 1.31(20¡æ) Solubility In water 20 mg/kg
(pH6.2 ,20¡æ). In acetone> 500, toluene >400, ethyl acetate
>400,methanol>400 (all in g/l, 20¡æ). Stability Hydrolysed by
acids and alkali.
Mode of Action:
¡¡¡¡Used as a herbicide safener in combination with fenoxaprop-p-ethyl,
for selective weed control in wheat, rye, triticale and some barley
varieties. Also under development for use in combination with iodosulfuron-methyl.
Toxicity:
Oral Acute oral LD50
for rats and mice>5000mg/kg. Skin and eye Acute percutaneous LD50
for rats>4000mg/kg.Non-irritating to skin and eyes(rabbits); not
a skin sensitiser (guinea pigs). Inhalation LC50(4h)for
rats>1.32mg/l.
