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Chemical Identification
Common Name
Metobenzuron
中文通用名
吡喃隆
IUPAC
(RS)-1-methoxy-3-[4-(2-methoxy-2,4,4-trimethylchroman-7-yloxy)phenyl]-1-methylurea
CAS
N′-[4-[(3,4-dihydro-2-methoxy-2,4,4-trimethyl-2H-1-benzopyran-7-yl)oxy]phenyl]-N-methoxy-N-methylurea
CAS No.
[111578-32-6]
Molecular Formula
C22H28N2O5
Molecular Structure
Category
Activity
Herbicides.Metobenzuron is a contact herbicide. It is most active when applied to weeds with between two and five leaves. Symptoms of necrosis are observed within five days of treatment and the weeds die within ten days. Adjuvants, for example crop oil concentrates, are required for optimum activity.

In field trials, metobenzuron showed very low levels of phytotoxicity to maize. Mitsui does not anticipate any problems with crops grown in rotation with maize, due to metobenzuron's lack of residual activity.
CropUse
CropUses:
maize

125-250 g ai/ha

Premix

Type

AI concn

Emulsifiable concentrate (EC)

25% (w/v)

Physical Properties
Molecular weight:400.5; Physical form:White powder. Melting point:101.0-102.5 °C; Solubility:In water 0.4 /l (25 °C).;
Toxicology
Oral:Acute oral 50 for rats and mice >10 000 /. Percutaneous:Acute percutaneous 50 for rabbits >2000 /kg. Non-irritating to skin and slightly irritating to eyes (rabbits). ADI:() 0.03 / (group with mancozeb, maneb and zineb) [
Environmental Profile
Environmental fate: 
Soil:50 in soil 4 h (under irradiation), 8 h (in the dark). Low mobility in sandy loam soil.
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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