PYRAZOSULFURON-ETHYL

GENERAL
PYRAZOSULFURON-ETHYL is a new rice herbicide belong in the sulfonylurea group. It has eminent activity against a broad spectrum of annual and perennial rice paddy weeds, especially broad leaf weeds and sedges, with pre-emergence and early post-emergence application and at extremely low use rates.

STRUCTURE

CAS NO.

 

93697-74-6

ACTIVITY

Herbicides
(Sulfonylurea Herbicides)

MOL WT.

C14H18N6O7S
414.3922
SYNONYMS
5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazole-4-
carboxylic acid 
Ethyl 5-(((((4,6-dimethoxy-2-pyrimidinyl)amino)carbonyl)amino)sulfonyl)-1-
methyl-1H-pyrazole-4-carboxylate

TOXICITY

Mammals

Acute oral LD50 for rats and mice >5,000mg/kg.
Acute dermal LD50 for rats >2,000mg/kg.
Acute inhalation LC50(4hr) for rats >3.9mg/งค air.
Non-irritating to skin and eyes for rabbits.
NOEL(2y) for rats 400 ppm.

Wildlife

Acute oral LD50 for bobwhite quail >2250mg/kg

Fish

TLm(48h) for carps >40ppm.

Bee

LD50 for honeybee > 100งถ/bee

PRECAUTION IN HANDLING

It should be under no circumstances whatsoever be handled by children or incompetent persons. While in storage, drum should be kept well sealed and stored in cool, dry and well ventilated place. In case of accidental ingestion, the patient should be taken to a doctor who should give symptomatic treatment.

SPECIFICATION

Appearance

White crystalline solid

Specific Gravity

1.44 g/cm3 at 20กษ

Vapor Pressure

0.0147 mPa at 20กษ

Melting Point

180~182กษ

Solubility(20กษ)

In water 1.45 × 10-2 g/งค.
In chloroform 234.4, methanol 0.7, hexane 0.2, acetone
31.7g/งค, benzene 15.6 (all in g/งค at 20กษ)

Partition Coefficient

Kow logP = 1.3 (20กษ)

Stability

Stable at 50 C for 6 month and stable under visible light.
Unstable in acidic or alkaline media.

Purity

97% min

COMMENTS