Monolinuron

CAS NO.：1746-81-2
Empirical Formula: C9H11ClN2O2
Molecular Weight: 214.65
MDL number: MFCD00055264
EINECS: 217-129-5
SAFETY DATA SHEET (SDS)
Update Date: 2026-07-31 15:25:13

What is Monolinuron?

Definition

ChEBI: Monolinuron is a member of ureas.

Reactions

Nitrite or nitrate induced-photolysis of monolinuron (a phenyl urea herbicide) using the 300–450 nm light excitation gives rise to various photo-products. The direct photolysis of monolinuron proceeds via two main pathways yielding, respectively, 3-(4-chlorophenyl)-1-methylurea, which results from demethoxylation of the N-terminus substituted functional group and 3-(4-hydroxyphenyl)-1-methoxy-1- methylurea obtained by photohydrolysis of the C-Cl bond[1].
Degradation pathways of monolinuron by direct and nitrite (or nitrate) induced photolysis. Specific photoproducts: circled numbers (direct); underlined numbers (induced):

Safety Profile

Moderately toxic by ingestion. Experimental teratogenic and reproductive effects. When heated to decomposition it emits very toxic fumes of Cland NOx.

References

[1] S. Nélieu. “Nitrite and nitrate induced photodegradation of monolinuron in aqueous solution.” Environmental Chemistry Letters 2 2 (2004): 83–87.

Properties of Monolinuron

Melting point:	81.5℃
Density	1.3575 (rough estimate)
refractive index	1.5790 (estimate)
Flash point:	100 °C
storage temp.	Sealed in dry,Room Temperature
form	neat
pka	12.80±0.70(Predicted)
color	White to Light yellow to Light orange
Water Solubility	0.58g/L(room temperature)
BRN	2212523
InChI	InChI=1S/C9H11ClN2O2/c1-12(14-2)9(13)11-8-5-3-7(10)4-6-8/h3-6H,1-2H3,(H,11,13)
EPA Substance Registry System	Monolinuron (1746-81-2)

Safety information for Monolinuron

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H302:Acute toxicity,oral H373:Specific target organ toxicity, repeated exposure H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P260:Do not breathe dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P270:Do not eat, drink or smoke when using this product. P273:Avoid release to the environment. P314:Get medical advice/attention if you feel unwell. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.