Structural Formula Vector Image
Title: 2,4-DB
CAS Registry Number: 94-82-6
CAS Name: 4-(2,4-Dichlorophenoxy)butanoic acid
Additional Names: 4-(2,4-dichlorophenoxy)butyric acid
Trademarks: Butyrac (Union Carbide); Legumex D
Molecular Formula: C10H10Cl2O3
Molecular Weight: 249.09
Percent Composition: C 48.22%, H 4.05%, Cl 28.47%, O 19.27%
Literature References: Selective post-emergence, translocated herbicide. First described as a plant growth regulator: M. E. Synerholm and P. W. Zimmerman, Contrib. Boyce Thompson Inst. 14, 369 (1947). Prepn: G. W. Kitchingman, A. C. Tucker, GB 804565 and GB 883255 (1958, 1961, both to ICI). Similar in activity to 2,4-D, q.v., but more selective. Mechanism of selectivity studies: D. L. King, D. E. Bayer, Proc. West. Soc. Weed Sci. 25, 37 (1972).
Properties: White crystals, mp 117-119°. Soly in water at 25°: 46 ppm. Sol in acetone, ethanol, diethyl ether. Slightly sol in benzene, toluene, kerosene.
Melting point: mp 117-119°
Derivative Type: Sodium salt
Trademarks: Embutox
Molecular Formula: C10H9Cl2NaO3
Molecular Weight: 271.07
Percent Composition: C 44.31%, H 3.35%, Cl 26.16%, Na 8.48%, O 17.71%
Properties: Water soluble; hard water will show precipitate as the calcium and magnesium salts.
Derivative Type: Dimethylamine salt
Trademarks: Butoxone
Molecular Formula: C12H17Cl2NO3
Molecular Weight: 294.17
Percent Composition: C 48.99%, H 5.82%, Cl 24.10%, N 4.76%, O 16.32%
Properties: Water sol; calcium and magnesium salts precipitate in hard water.
Use: Herbicide.

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