S-Metolachlor CAS NO.178961-20-1

Active ingredient

S-Metolachlor

Chemical name

A mixture of (S)-2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide and
(R)-2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide in the proportion 80-100% to 20-0%

Classification

Herbicide / Agrochemical

Biochemistry

Cell division inhibitor; more recent research suggests chloroacetamides may inhibit synthesis of very long chain fatty acids.
Maize tolerance of chloroacetamides is attributed to rapid detoxification by glutathione S-transferases.

Mode of action

Selective herbicide, absorbed predominantly by the hypocotyls and shoots; inhibits germination.

Usage

Control of annual grasses (Echinochloa, Digitaria, Setaria, Brachiaria, Panicum, and Cyperus) and some broad-leaved weeds
(Amaranthus, Capsella, Portulaca) in maize, sorghum, cotton, sugar beet, fodder beet, sugar cane, potatoes, soya beans, peanuts,
sunflowers, various vegetables, and pulse crops. Applied pre-plant incorporated, pre-emergence or early post-emergence, at 0.8-1.6
kg/ha. Often used in combination with broad-leaved herbicides, to extend spectrum of activity.

Item

Standard

Test Results

Identification

A.H-NMR:Comply with the structure

Complies

B.LC-MS:Comply with the structure

Complies

C.The IR spectrum of sample should be identical with that of reference standard.

Complies

D.HPLC-ESI-MS

The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that in the chromatogram of the Standard preparation, as obtained in the Assay.

Complies

Loss on drying

≤2.0%

0.19%

Heavy metals

≤10 ppm

<10ppm

Water

≤1.0%

0.1%

Sulphated ash

≤0.5% determined on 1.0 g.

0.009%

Residue on ignition

≤0.1%

0.03%

Related Substances

Unspecified impurities: for each impurity ≤0.10%

<0.10%

Total Impurity ≤0.5%

0.18%

Purity

≥99.0%

99.7%

Assay

99.0%~101.0% (anhydrous substance).

99.8%

Storage

Preserve in well-closed, light-resistant and airtight containers.

Complies