Detailed Product Description

Common Name 2, 4-D
IUPAC (2, 4-dichlorophenoxy)acetic acid
CAS (2, 4-dichlorophenoxy)acetic acid
CAS No. 94-75-7
Molecular Formula: C8H6Cl2O3

Properties
Molecular weight:221.0. Physical form:Colourless powder, with a slight phenolic odour. Density: 0.7-0.8; Composition:Tech. is 96% pure. Melting point:140.5 °C; Vapour pressure:1.86 × 10-2 mPa(25 °C, OECD 104); Henry constant:1.32 × 10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 2.58-2.83 (pH 1), 0.04-0.33 (pH 5); pKa:2.73. Solubility:In water 311 (pH 1), 20 031 ( pH 5), 23 180 (pH 7), 34 196 (pH 9) (all in mg/l, 25 °C). In ethanol 1250, diethyl ether 243, heptane 1.1, toluene 6.7, xylene 5.8 (all in g/; Stability:2, 4-D is a strong acid, and forms water-soluble salts with alkali metals and amines. Hard water leads to precipitation of the calcium and magnesium salts, but a sequestering agent is included in formulations to prevent this.