Iodosulfuron methyl sodium Chemical Properties

Melting point:

152°

storage temp. 

0-6°C

solubility 

Solubility in organic solvents (g/l at 20 °C)
Acetonitrile 52
Ethyl acetate 23
n‐Heptane 0.001
Methanol 12
2‐Propanol 4.4
Toluene 2.1

pka

Dissociation constant (pKa at 20 °C) 3.22 (Under strong acidic conditions – pH 2 – formation of iodosulfuron‐methyl)

color 

Off-White to Pale Beige

Water Solubility 

Solubility in water (g/l at 20 °C) 0.16 (pH 5) 25.0 (pH 7) 65.0 (pH 9).

CAS DataBase Reference

144550-36-7(CAS DataBase Reference)

EPA Substance Registry System

Iodosulfuron-methyl-sodium (144550-36-7)

Safety Information

Hazard Codes 

N

Risk Statements 

50/53

Safety Statements 

60-61

RIDADR 

UN 3077

WGK Germany 

2

Toxicity

LD50 in rats (mg/kg): 2678 orally; >2000 dermally (Hacker)

Iodosulfuron methyl sodium Usage And Synthesis

Uses

Iodosulfuron Methyl Ester Sodium is used as a pesticide.

Agricultural Uses

At a rate of 2.5–10 g a.i. ha−1, iodosulfuron‐methyl‐sodium (AE F115008) controls more than 50 different broadleaf weed species, including some very competitive weeds that cause a substantial reduction of cereal productivity, for example, G. aparine, M. chamomilla, S. media, Raphanus ssp., Cirsium arvense, and Lamium ssp. While the application of iodosulfuronmethyl‐ sodium at the lower end of the suggested use rate is usually sufficient for control of broadleaf weeds, a higher rate is needed for consistent grass weed control. Major grass weeds controlled with a 7.5–10 g a.i. ha−1 dose rate applied at the three‐leaf stage up to the end of tillering are Agrostis gigantea, A. spica‐venti, Lolium multiflorum, L. perenne, L. persicum, L. rigidum, Phalaris brachystachys, P. canariensis, P. paradoxa, P. annua, and P. trivialis.
When introduced in 1999, iodosulfuron‐methyl‐sodium was the first “safened” sulfonylurea herbicide available commercially and has been marketed by Bayer CropScience for use both in cereals and maize. A “safener,” such as mefenpyr‐ diethyl, is a chemical that, when applied to crop plants, reduces the injury caused by herbicides to an acceptable level. Ideally, a safener does not reduce activity against the target weeds. When a series of experiments was conducted to compare the behavior of iodosulfuron‐methyl‐sodium with and without mefenpyr‐diethyl as safener, the results suggested that the safener acted via a specific catalytic enhancement of herbicide degradation in cereals, but not in target weeds such as wild oat.
In cereals, iodosulfuron‐methyl‐sodium is available commercially under the trade name “Hussar” as a straight product in a 1 : 3 ratio with mefenpyr‐diethyl as safener. The compound is also sold in various combinations with other mixing partners, such as “Hussar® OF” (+ fenoxaprop‐p‐ethyl + mefenpyr‐diethyl), “Sekator®/Chekker®” (+ amidosulfuron + mefenpyr‐diethyl), “Cossack®” (+ mesosulfuron + mefenpyrdiethyl), and “Atlantis®” (+ mesosulfuron + mefenpyr‐diethyl).

Iodosulfuron methyl sodium(144550-36-7)Related Product Information

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