Title: Dichlorprop
CAS Registry Number: 120-36-5
CAS Name: 2-(2,4-Dichlorophenoxy)propanoic acid
Additional Names: (±)2-(2,4-dichlorophenoxy)propionic acid; 2,4-DP; dichloroprop
Trademarks: Dicopur DP (Nufarm); Polymore (Unicrop)
Molecular Formula: C9H8Cl2O3
Molecular Weight: 235.06
Percent Composition: C 45.99%, H 3.43%, Cl 30.17%, O 20.42%
Literature References: Selective pre- and post-emergent herbicide. Exists in two optically active forms; only the (+)-isomer shows biological activity. First prepd and described as a plant growth regulator: M. E. Synerholm, P. W. Zimmerman, Contrib. Boyce Thompson Inst. 14, 91 (1945). Commercial prepn: H. A. Stevenson, R. F. Brookes, GB 822199 (1959 to Boots). Resoln of enantiomers and biological activity: S. T. Collins, F. E. Smith: J. Sci. Food Agric. 3, 248 (1952). Field studies and toxicology: W. O. G. Nuyken et al., Meded. Fac. Landbouwwet. Rijksuniv. Gent 52, 1139 (1987). Enantiomeric effects on degradation: A.W. Garrison et al., Environ. Sci. Technol. 30, 2449 (1996). GC/MS determn in soil: T. Heberer, H.-J. Stan, J. AOAC Int. 79, 1428 (1996).
Properties: Colorless crystals, mp 117-118°. Soly in water at 20°: 350 ppm. Readily sol in organic solvents. Corrosive to metals in the presence of water.
Melting point: mp 117-118°
Derivative Type: (R)-(+)-Form
CAS Registry Number: 15165-67-0
Additional Names: Dichlorprop-P
Trademarks: Duplosan DP (BASF)
Properties: Colorless needles from benzene, mp 124°. [a]21D +26.6° (c = 1.23 in ethanol).
Melting point: mp 124°
Optical Rotation: [a]21D +26.6° (c = 1.23 in ethanol)
Use: Herbicide.

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