N-Octyl ester

Aquatic HS inhibited the base-catalyzed hydrolysis of the n-octyl ester of 2,4-D (i.e., 2,4-DOE). The hydrolysis rate of 2,4-DOE at pH 9-10 decreased by a factor equal to the fraction of the ester associated with the DHS. These observations are consistent with an unreactive humic-bound 2,4-DOE in equilibrium with reactive aqueous-phase 2,4-DOE. Thus, association between Dha and 2,4-DOE inhibited the base-catalyzed hydrolysis reaction. 

Benzenedicarboxylic acid, di-n-octyl ester, see Di-n-octyl phthalate... 

Alkaline Hydrolysis Studies. Alkaline catalyzed hydrolysis kinetics in sediment/water systems have been investigated for chlorpyrifos and the methyl and n-octyl esters of 2,4-dichlorophenoxyacetic acid (2,4-D). 

Esters of 2,4-D. Studies of the alkaline hydrolysis of the methyl and n-octyl esters of 2,4-D in sediment/water systems (24), though less detailed than the chlorpyrifos studies, show similar effects. Results from Investigations using EPA-13 at pH s near 10 for the methyl and octyl esters of 2,4-D are summarized in Figure 7. Under the conditons in these experiments, the fractions of the methyl and octyl esters which are sorbed to the sediment are 0.10 and 0.87, respectively. The aqueous hydrolysis half-lives of the methyl and octyl esters at pH=10 are 3.6 and 27 minutes, respectively. In the sediment/water system, the methyl ester, which is mainly in the dissolved phase, hydrolyzes at a rate similar to that expected for the sediment-free system at the same pH. The octyl ester, on the other hand, hydrolyses at a rate which is considerably retarded (and non-first-order) when compared to the expected aqueous phase rate. Though the data are less detailed and do not permit calculations similar to those conducted for chlorpyrifos, it is clear that the effect of sorption is to considerably slow the alkaline hydrolysis rate. 

Figure 7. Alkaline hydrolysis of the 2,4-D methyl ester CpH 10.01) and 2,4-D n-octyl ester (pH 10.12) from heat-sterilized EPA-13 sediment/water systems.

Unfortunately, there is presently only a very tentative bit of evidence available to substantiate this prediction. In one experiment at an acid pH, the overall rate of hydrolysis of the n-octyl ester of 2,4-D was measured in a sediment/water slurry in which a substantial fraction of the ester was sorbed. The rate was observed to be substantially faster than the predicted aqueous phase rate. Though this is an indication that the above prediction is correct, much more experimental work is needed to substantiate and quantify this predicted rate enhancement. 

Synonyms Di-N-octylphthalate (preferred name) 1,2-Benzenedicarboxylic acid dioctyl ester Dioctyl-O-benzenedicarboxylate DNOP N-Octyl phthalate O-Benzenedicarboxylic acid dioctyl ester Octyl phthalate Phthalhc acid dioctyl ester Benzenedicarboxylic acid di-n-octyl ester... 

The alkylation of potassium benzoate with n-octyl bromide under classical solid-liquid PTC (crown ether, chloroform) leads to only 58 % of n-octyl ester after 40 h at 85 °C. Under solvent-free conditions (2% of Aliquat), yield is quasi-quantitative (95%) within 2 h at the same temperature [Eq. (47)] [81]. 

Beilstein Handbook Reference) AI3-15071 (USDA) Benzenedicarboxylic acid di-n-octyl ester 1,2-Benzenedicarboxylic acid, dioctyl ester BRN 1915994 CCRIS 6196 Celluflex DOP Di-n-octyl phthalate Dicapryl phthalate Dinopol NOP Dioctyl 1,2-benzenedicarboxylate Dioctyl o-benzenedicarboxylate Dioctyl phthalate Dioktylester kyseliny ftalove DNOP EINECS 204-214-7 HSDB 1345 NSC 15318 Octyl phthalate Phthalic acid, dioctyl ester Polycizer 162 Px-138 RCRA waste number U107 Vinicizer 85. Liquid mp = 25 Xm = 223, 274 nm (cyclohexane). 

SYNONYMS DNOP, benzenedicarboxylic acid di-n-octyl ester, n-dioctyl phthalate, octyl phthalate, bis(n-octyl) phthalate, vinicizer 85, dioctyl o-benzenedicarboxylate, celluflex... 

Octyl epoxy tallate. See Epoxidized octyl tallate n-Octyl ester of 3,4,5-trihydroxybenzoic acid. See Octyl gallate Octyl ether. See Dioctyl ether Octyl formate... 

Table 15.7 Effect of AOT concentration (iVy Qj) on the reaction rate (i ) and the enantiomer excess value of ibuprofen n-octyl ester (ee. ).

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