Phenoxy butyric acid

Chau and Terry [146] reported the formation of penta-fluorobenzyl derivatives of ten herbicidal acids including 4-chloro-2-methyl-phenoxy acetic acid [145]. They found that 5h was an optimum reaction time at room temperature with pentafluorobenzyl bromide in the presence of potassium carbonate solution. Agemian and Chau [147] studied the residue analysis of 4-chloro-2-methyl phenoxy acetic acid and 4-chloro-2-methyl phenoxy butyric acid from water samples by making the pentafluorobenzyl derivatives. Bromination [148], nitrification [149] and esterification with halogenated alcohol [145] have also been used to study the residue analysis of 4-chloro-2-methyl phenoxy acetic acid and 4-chloro-2-methyl phenoxybutyric acid. Recently pentafluorobenzyl derivatives of phenols and carboxylic acids were prepared for detection by electron capture at very low levels [150, 151]. Pentafluorobenzyl bromide has also been used for the analytical determination of organophosphorus pesticides [152],... 

The 4-substituted analogue of the current invention, (E)-4- 4-[2-(4-pyridinyl)-ethenyl]-phenoxy -butyric acid ethyl ester, (I), was also prepared by the author and is discussed. 

P-chloro-o-cresol is the precursor for the pesticides MCPA (2-methyl-4-chloro-phenoxyacetic acid), MCPP (2-methyl-4-chloro-phenoxy propionic acid) and MCPB (2-methyl-4-chloro-phenoxy butyric acid). MCPP is also known as mecoprop. 

Fig. 5 Schematic representation of the block copolymer synthesis using the example of poly(2-(2-(4-(4-(4-cyano-phenylazo)-phenoxy)-butyric acid)ethyl es ter)et h y I cnc)-block- pol y st y re n e.

Fmoc-aminomethyl-3,5-diethoxy-phenoxy)butyric acid (BAL)... 

C12H16O3 4-phenoxy-butyric acid ethyl ester 2364-59-2... 

Agemian and Chau [190] have reported a method for determining low levels of 4-chloro-2-methylphenoxyacetic acid and 4-(4-chloro-2-methyl-phenoxy)-butyric acid in non scdine and waste waters by derivatisation with pentafluorobenzyl bromide. The increased sensitivity of the penta-fluorobenzyl esters of these two herbicides over the 2-chloroethyl methyl esters as well as their longer retention times make pentafluoro-benzyl bromide the preferred reagent. 

For solid-phase synthesis various linker molecules were constructed on the ULTRA resin 15. To determine the optimal spacer length, ULTRA resins were coupled with spacers of variable length. With 4-(4 -acetoxy-methyl-3 -methoxy-phenoxy) butyrate and a loading of 2.5 mmol/g the synthesis of heterocycles and peptides was investigated. A pyrazole carboxylic acid was prepared using a procedure established for Wang polystyrene... 

Beilstein Handbook Reference) BRN 1976809 Buratal Butanoic acid, 4-(2,4-dichloro-phenoxy)- Butirex Butomnone Butoxon Butoxone Butoxone amine Butoxone ester Butyrac Butyrac 118 Butyrac 200 Butyrac ester Butyric acid, 4-(2,4-dichlorophenoxy)- Campbell s DB Straight Caswell No. 316 CCRIS 1021 DB 2,4-DB 2,4-D butyric acid 2,4-... 

Some synthetic pesticides and drugs have a phenyl or a naphthyl ring attached to the principal chain of fatty acids. The phenoxy acid pesticides, which are derivatives of formic, acetic, propionic, or butyric acids, belong to the synthetic fatty acids (SFAs) family. These acids are usually referred to as phenoxy acids and not as fatty acids, although they should be included in the fatty acids family, because they are derivatives of fatty acids. One such example is (2-methyl-4-chlorophenoxy)acetic acid (Figure 16). 

V /(mm /s) 5414 2.026 C28H32O3 1.146 0.9167 4-(4-phenoxy-phenyl)-4-phenyl-butyric acid hexyl ester 20883-77-6... 

Aromatic i)3-phenoxy-3 hydroxy-butyric acid i) COOHCH CH(OH)CHOC H,... 

Types within group Cellulose acetate, cellulose acetate butyrate, cellulose nitrate, polyvinyl acetate, vinyl vinylidene, polyvinyl acetals, polyvinyl alcohol, polyamide, acrylic, phenoxy Cyanoacrylate, polyester, urea formaldehyde, melamine formaldehyde, resorcinol and phenol-resorcinol formaldehyde, epoxy, polyimide, polybenzimidazole, acrylic, acrylate acid diester Natural rubber, reclaimed rubber, bulyl, polyisobutylene, nitrile, styrene-butadiene, polyurethane, polysulfide, silicone, neoprene Epoxy-phenolic, epoxypolysulfide, epoxy-nylon, nitrile-phenolic, neoprene-phenolic, vinyl-phenolic... 

Introduction of an alkyl group into the side-chain of phenoxy- or substituted phenoxyacetic acids ( -substituted propionic, butyric, isobutyric or valeric acids) is interesting mainly because of the resulting optical activity and the different activities of the antipodes cf. Section 9) or because of... 

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