Compounds Derived from Phenoxyacetic Acid

Martin, Aromatic Hydrvxyketones Preparation and Physical Properties, 

One note a very large dispersion of the various melting points. 

4-dihydroxy-a-phenoxyacetophenone with dimethyl sulfate in the presence of potassium carbonate in boiling acetone for 2.5 h (83%) [5011], 

OCH3 Obtained (by-product, unusual result) by methylation of 

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All these compounds are organosilicon ethers of biogenic amines (triethanolamine, diethylamine) or diethylene glycol. But we failed to obtain similar atrane derivatives of glycerin. At the same time we obtained and described for the first time silatrane analogs of indolylacetic acid (heteroauxin) and of synthetic phitohormones from phenoxyacetic acids. 

Compounds Derived from Substituted Phenoxyacetic Acids... 

Compounds Derived from Substituted Phenoxyacetic Acids [5958] p. 1355... 

Larose and Chau [189] state that owing to the similar retention times of several common phenoxyacetic acid type herbicides the alkyl esters are subject to incorrect identification if several herbicides are present. Also, the sensitivity obtainable by means of electron capture detection of the alkyl esters by some herbicides, such as MCPA and MCPB is very poor and therefore the method is generally not suitable for the determination of these compounds in water. In addition, the methyl ester of MCPA has a very short retention time close to the solvent front and is prone to interference from sample coextractives, which usually appear in this region. In fact the MCPA methyl ester often cannot be detected even at higher levels because of overlapping with coextraction peaks when the same gas chromatographic parameters as for the determination of organochlorine pesticides are used. Hence other derivatives have been considered. 

The important thing concerning volatility at various temperatures is the relative amount of material in the atmosphere at the different temperatures. If one knows the latent heat of vaporization, the tendency of the material to vaporize can be calculated from Equation 3. If we now consider preparations of derivatives whereby vapor loss can be reduced, it is immediately apparent that the latent heat of vaporization must be increased. This can be done with the phenoxyacetic acid compounds in preparing the so-called low volatile esters as represented by the butoxy-ethanol ester as illustrated in Table II. Determinations of the ratio of the latent heat of vaporization of the butoxyethanol ester to that of the isopropyl ester indicated a value of about 2. 

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