Etoxazole

Etoxazole is a narrow spectrum systemic acaricide used to combat spider mites. It targets a variety of mites in the egg, larvae and nymph stages however not the adult stage. It also exhibits insecticidal activity towards aphids, the green rice leafhopper and diamondback moth. The mode of action was originally suspected to inhibit the molting process but has since been shown to inhibit chitin synthesis.[2][3] Resistance due to its high efficacy and cross resistance when used with other acaricides are both of concern similar to was seen in the fast development of cross resistance in the previous generation of acaricides. The LC50 for resistant mite strains has been observed over 100,000 times greater than that of susceptible strains. Thus resistance management strategies are important in order to limit the increase of etoxazole resistant mite strains.[3][4]

Etoxazole
Names
IUPAC name
2-(2,6-Difluorophenyl)-4-[2-ethoxy-4-(2-methyl-2-propanyl)phenyl]-4,5-dihydro-1,3-oxazole
Other names
(R,S)-5-tert-butyl-2-[2,6-difluorophenyl)-4,5-dihydro-1,3-oxazol-4-yl]phenetole [1]
Identifiers
3D model (JSmol)
8930214
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.107.983
EC Number
  • 604-891-2
KEGG
UNII
Properties
C21H23F2NO2
Molar mass 359.417 g·mol−1
Appearance colorless crystalline powder with a musty odor [1]
Density 1.238 [1]
Melting point 101.5–102.5°C [1]
insoluble in H2O, slightly soluble in hexane, n-heptane, soluble in MeOH, EtOH, acetone, cyclohexanone, THF, MeCN, EtOAc, xylene.[1]
log P Kow 5.59 [1]
Vapor pressure 7 mPa @ 25°C [1]
Hazards
GHS pictograms
GHS Signal word Warning
GHS hazard statements
 H400, H410
P273, P391, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Etoxazole has a mammalian toxicity LD50 of 5 g/kg and an environmental persistence DT50 of 19 days.[2] Toxicity towards fish is of potential concern.

Etoxazole was discovered in the 1980s by Yashima and was released for commercial use in 1998 in Japan. It is sold under various commercial preparations for crop application such as TetraSan 5 WDG[5] and Zeal by Valent in the United States.

Stereoisomerism
Etoxazole
(2 stereoisomers)

(S)-configuration
(R)-configuration
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References
  1. Müller, Franz; Streibert, Hans Peter; Farooq, Saleem (2009). Acaricides. Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a01_017.pub2. ISBN 978-3527306732.
  2. Dekeyser, Mark A (2005-02-01). "Acaricide mode of action". Pest Management Science. 61 (2): 103–110. doi:10.1002/ps.994. ISSN 1526-4998. PMID 15625668.
  3. Nauen, Ralf; Smagghe, Guy (2006-05-01). "Mode of action of etoxazole". Pest Management Science. 62 (5): 379–382. doi:10.1002/ps.1192. ISSN 1526-4998. PMID 16555232.
  4. Uesugi, R.; Goka, K.; Osakabe, M. H. (2002-12-01). "Genetic Basis of Resistances to Chlorfenapyr and Etoxazole in the Two-Spotted Spider Mite (Acari: Tetranychidae)". Journal of Economic Entomology. 95 (6): 1267–1274. doi:10.1603/0022-0493-95.6.1267. ISSN 0022-0493. PMID 12539841.
  5. "TetraSan 5 WGD product label" (PDF). Valent. Retrieved 2016-03-20.
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