Chemical Identification
Common Name
(RS)-1-methylhexyl (5-chloroquinolin-8-yloxy)acetate
1-methylhexyl [(5-chloro-8-quinolinyl)oxy]acetate
Molecular Formula
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Molecular Structure
Herbicide Safener.
Cloquintocet-mexyl is applied in combination with post-emergence herbicides based on clodinafop-propargyl. It acts by accelerating the metabolism of the herbicide in small-grain cereals.

Field trials indicate that the product is most effective in wheat, rye and triticale. It is less effective at safening clodinafop-propargyl to barley and oats.

Used as a herbicide safener in combination with clodinafop- propargyl for selective control of annual grasses (Alopecurus myosuroides, Avena spp., Lolium spp., Phalaris spp., Poa trivialis, Setaria spp.) in small grain cereals.

Physical Properties
Molecular weight:335.8. Physical form:Colourless crystals. Density:1.05 g/cm3 (20 °C); Melting point:69.4 °C; ( tech., 61.4-69.0 °C); Vapour pressure:5.31×10-3 mPa (25 °C) ( OECD 104); Henry constant:3.02×10-3 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 5.03 (25 °C); pKa:3.5-4 (weak base, est.); Solubility:In water 0.59 mg/l (25 °C). In ethanol 190, acetone 340, toluene 360, n-hexane 0.14, n-octanol 11 (all in g/l, 25 °C).; Stability:Stable in acidic and neutral media, hydrolysed in alkaline media. DT50 (25 °C) 133.7 d ( pH 7).

Oral:Acute oral LD50 for rats and mice >2000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to eyes and skin (rabbits). May cause skin sensitisation (guinea pigs). Inhalation: LC50 (4 h) for rats >0.935 mg/l air.

Environmental Profile

Algae: EC50 (96-120 h) for Scenedesmus subspicatus 0.63, Microcystis 2.5, Navicula 1.7 mg/l.Bees:Non-toxic. LC50 (48 h, oral and contact) >100 μg/bee.Birds:Non-toxic. LD50 for mallard ducks and bobwhite quail >2000 mg/kg.Daphnia: LC50 (48 h) >100 mg/l.Fish:Non-toxic. LC50 (96 h) for rainbow trout and carp >76, bluegill sunfish >51, catfish 14 mg/l.Worms: LC50 for earthworms >1000 mg/kg. 
Environmental fate: 
Animals:Hydrolysed to the free acid as the major metabolite.Soil:In soil, rapid degradation to the free acid, DT50 0.5-2.4 d. Further degradation and mineralisation of the acid occur within a few weeks to a few months. Cloquintocet- mexyl and its major metabolites have low soiPlant:Rapidly degraded to the free acid as the major metabolite.
WATER SOLUBILITY: 0.59 mg/l at 25° C.

Mallard duck

LD50 >2,000 mg/kg

Bobwhite quail

LD50 >2,000 mg/kg

Rainbow trout[96 hrs]

LC50 >76 mg/litre

Bee [48 hrs contact]

LD50 >100 μg/bee

Bluegill sunfish [96 hrs]

LC50 >51 mg/litre

Daphnia[48 hrs]

LC50 >100mg/litre

Fate in soil:
Cloquintocet-mexyl is strongly adsorbed by soil particles and is only slightly mobile. The product is rapidly degraded. The half-life in soil is about 1 day.

Transport Information

Hazard Class:III (Slightly hazardous)

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