Permethrin - Cas 52645-53-1, C21h20cl2o3, Yellow-brown Liquid | High Purity ≥93%, Stable At Ph 4

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Chemical name: (1RS,3RS;1RS,3SR)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
Roth: 3-phenoxybenzyl (1RS)-cis-trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate
CAS number.: 52645-53-1
Molecular formula: C21H20Cl2O3
Molecular weight: 391.29
Technical: a Y93%
Appearance: yellow-brown to brown liquid
M.p. 34-35 A C; cis- isomers 63-65 A C; trans- 44-47 A C
B.p. 200 A C/0.1 mmHg; >290 A C/760 mmHg
V.p. cis- 0.0025 mPa; trans- 0.0015 mPa (both 20 A C) (D. Wells et al., Pestic. Sci., 1986, 17,473)
KOW logP = 6.1 (20 A C)
S.g./density 1.29 (20 A C)
Solubility In water 6 A' 10-3 mg/l (pH 7, 20 A C). In xylene, hexane >1000, methanol 258 (all in g/kg, 25 A C).
Stability Stable to heat (A 2 y at 50 A C), more stable in acidic than alkaline media with optimum stability c. pH 4; DT50 50 d (pH 9), stable (pH 5, 7) (all 25 A C). Some photochemical degradation observed in laboratory studies, but field data indicate this does not adversely affect biological performance.
F.p. >100 A C ('Perigen')

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