Bensulfuron methyl Property

Melting point:

185-188°C

Density 

1.4087 (rough estimate)

refractive index 

1.6000 (estimate)

storage temp. 

0-6°C

solubility 

Acetonitrile (Slightly), Dichloromethane (Slightly), DMSO (Slightly)

form 

Solid

pka

12.34±0.70(Predicted)

color 

White to pale yellow

Odor

odorless solid

BRN 

7447488

Stability:

Moisture Sensitive, Unstable in Solution

InChIKey

XMQFTWRPUQYINF-UHFFFAOYSA-N

CAS DataBase Reference

83055-99-6

EPA Substance Registry System

Bensulfuron-methyl (83055-99-6)

Safety

Hazard Codes 

Xi;N,N,Xi

Risk Statements 

43-51/53

Safety Statements 

2-24-37-61

RIDADR 

UN 3077 9/PG 3

WGK Germany 

2

RTECS 

DG8733000

HS Code 

29350090

Toxicity

LD50 orl-rat: >5 g/kg NNGADV 16,343,91

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H317May cause an allergic skin reaction

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P272Contaminated work clothing should not be allowed out of the workplace.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P333+P313IF SKIN irritation or rash occurs: Get medical advice/attention.

Bensulfuron methyl Chemical Properties,Usage,Production

Description

Bensulfuron-methyl (BSM) is a new kind of sulfonylurea herbicide widely used to control various weeds and sedges. It is moderately soluble in water, non-volatile and moderately mobile. It would not be expected to persistent in soil but could be persistent in water systems under certain conditions. It is not highly toxic to mammals. It also shows a low toxicity to birds and earthworms but is more of a concern to aquatic plants, algae and honeybees.

Uses

Bensulfuron methyl (BSM) was the first sulfonylurea herbicide commercialized for use in rice, and it remains the dominant sulfonylurea for broadleaf and sedge weed control in this crop.

Definition

ChEBI: Bensulfuron-methyl is the methyl ester of bensulfuron. An acetolactate synthase inhibitor, it is used as a herbicide for the control of a variety of both annual and perennial weeds in crops, particularly wheat and rice. It is not licensed for use within the UK. It has a role as a herbicide, an agrochemical and an EC 2.2.1.6 (acetolactate synthase) inhibitor. It is a N-sulfonylurea, a member of pyrimidines, a methyl ester and an aromatic ether. It derives from a bensulfuron.

Safety Profile

Moderately toxic by ingestion.When heated to decomposition it emits toxic vapors ofNOx and SOx.

Metabolic pathway

Bensulfuron methyl is metabolized by mammals and birds and the major metabolites identified include mono-O-demethylated and 5-hydroxylated bensulfuron methyl and 5-hydroxy-2-amino-3,5- dimethoxypyrimidine. As bird metabolites, cleavage of the pyrimidine ring of bensulfuron methyl is observed which results in two pyrimidine ring-opening metabolites. In rice plants, bensulfuron methyl undergoes rapid O-demethylation at one of the methoxy groups on the pyrimidine ring which will proceed through hydroxylation at the methyl group. Alcoholysis and hydrolysis of bensulfuron methyl (H1) involve mainly the breakdown of the urea moiety which leads to several degradation products, some of which are also identified as metabolites in mammals and plants.