Title: Silvex
CAS Registry Number: 93-72-1
CAS Name: 2-(2,4,5-Trichlorophenoxy)propanonic acid
Additional Names: fenoprop; 2,4,5-TP
Molecular Formula: C9H7Cl3O3
Molecular Weight: 269.51
Percent Composition: C 40.11%, H 2.62%, Cl 39.46%, O 17.81%
Literature References: Selective pre- and post-emergence herbicide. Prepn: Toothill et al., Ann. Appl. Biol. 44, 547 (1956). Toxicity: G. W. Bailey, J. W. White, Residue Rev. 10, 97 (1965).
Properties: Crystals, mp 181.6°. Soly at 25° in water 0.014%; acetone 15.2%; benzene 0.16%; carbon tetrachloride 0.024%; ether 7.13%; heptane 0.017%; methanol 10.5%. LD50 orally in rats: 650 mg/kg (Bailey, White).
Melting point: mp 181.6°
Toxicity data: LD50 orally in rats: 650 mg/kg (Bailey, White)
Derivative Type: Triethanolamine salt
CAS Registry Number: 17369-89-0
Additional Names: Silvexamine
Molecular Formula: C9H7Cl3O3.C6H15NO3
Molecular Weight: 418.70
Percent Composition: C 43.03%, H 5.30%, Cl 25.40%, O 22.93%, N 3.35%
Properties: Sol in water.
Derivative Type: Propylene glycol butyl ether ester
CAS Registry Number: 2317-24-0
Trademarks: Kuron (Dow)
Molecular Formula: C16H21Cl3O4
Molecular Weight: 383.69
Percent Composition: C 50.09%, H 5.52%, Cl 27.72%, O 16.68%
Literature References: Prepn: Williams, US 2749360 (1956 to Dow).
CAUTION: Irritating to eyes, skin, mucous membranes.
Use: Formerly in the control of woody plants on uncropped land.
Status: This monograph has been retired and is no longer subject to revision or update.

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