4- chloro-2-methylphenoxy-acetic acid

See also 4-Chloro-2-methylphenoxy acetic acid.) [PESTICIDES] (Vol 18)... 

Phenoxyalkanoic acid herbicides are not amenable to direct gas chromatographic determination because of the high polarity or low volatility of the compounds and must be converted to their more volatile derivatives. The sensitivity of the electron capture detector towards alkyl esters of 4-chloro-2-methylphenoxy acetic acid, 4-chloro-2-methylphenoxy butyric acid, etc., is very poor. The methyl ester of 4-chloro-2-methylphenoxy acetic acid was 100 times less sensitive to electron affinity detection than the 2,4-D-methyl ester [396]. 

Chau and Terry [397] reported the formation of pentafluorobenzyl derivatives of ten herbicidal acids, including 4-chloro-2-methyl-phenoxyacetic acid [ 396 ]. They found that five hours was an optimum reaction time at ambient temperature with pentafluorobenzyl bromide in the presence of potassium carbonate solution. Bromination [398], nitrification [399] and esterification with halogenated alcohol [396] have also been used to study the residue analysis of 4-chloro-2-methylphenoxy acetic acid and 4-chloro-2-methylphenoxybutyric acid. Pentafluorobenzyl derivatives of phenols and carboxylic acids were prepared for detection by electron capture at very low levels [400,401 ]. 

D 2,4,5-T Silvex 2.4- DB MCPA Dichlorprop Dicamba (2,4-dichlorophenoxy) acetic acid (2,4,5-trichlorophenoxy) acetic acid (2,4,5-trichlorophenoxy)propionic acid 4-(2,4-dichlorophenoxy) butyric acid (4-chloro-2-methylphenoxy)acetic acid 2-(2,4-dichlorophenoxy)propionic acid 3,6-dichloro-2-methoxybenzoic acid... 

Chemical Name (4-chloro-2-methylphenoxy)acetic acid 4-chloro-o-tolyloxyacetic acid... 

CHLORO-3-METHYLPHENOL see CFD990 (4-CHLORO-2-METHYLPHENOXY)ACETIC ACID see CIR250... 

C9H8N2 4-phenyllmldazole 670-95-1 21.25 1.1148 2 16324 C9H9CI03 (4-chloro-2-methylphenoxy)acetic acid 94-74-6 25.00 1.2730 2... 

Isolation and trace enrichment in off-line and on-line modes were described together with TSP-LC-MS determination of the spiked phenoxy acetic acid herbicides 2,4-dichlorophenoxy acetic acid (2,4-D), 4-chloro-2-methylphenoxy acetic acid... 

Abbreviated names are derived from chemical or common names DDT (dichlorodiphenyltrichloroethane), HCH (1.2.3.4.5.6-hexachlorocyclohexane), PCNB (pentachloronitrobenzene), TCNB (1,2,4,5-tetrachloro-3-nitrobenzene), 2,3,6-TBA (2,3,6-trichlorobenzoic acid), TCA (trichloroacetic acid), 2,4-D [(2,4-dichlorophenoxy)acetic acid], 2,4-DB [4-(2,4-dichlorophenoxy)butyric acid], MCPA [(4-chloro-2-methylphenoxy)acetic acid)], MCPB [(4-chloro-o-tolyloxy)butyric acid)], 2,4,5-T (trolamine or 2,4,5-T-triethylammonium), EPTC (S-ethyIdipropylthiocarbamate), GA3 (gibberellic acid or gibberellin A3). 

Photodecarboxylation in the presence of photocatalysts such as TiOj has also been studied. For example, the photodegradation of (4-chloro-2-methylphenoxy)acetic acid, a herbicide, in an aqueous solution of TiOj involves elimination of carbon dioxide from the initially formed radical species on the catalyst surface. The templating of carboxyHc acids with polyethylene films has been found to enhance the photodecarboxylation at the expense of the photo-Fries rearrangement in simple aryl esters such as phenyl and 1-naphthyl esters." ... 

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