Peroxycarboxylic acids determination

Formation of polymeric peroxycarboxylic acids of variously grafted celluloses, such as 228 and 229, where the thick line represents the main cellulose strand, and assessment of their thermal stability by following their decomposition at various temperatures is based on iodometric determination of the peracids . 

CZE-ELD, with a Au microelectrode at —0.6 V vs. SCSE and a Pt wire as auxiliary electrode, using sodium borate buffer and dodecyltrimethylammonium bromide for dynamic coating of the capillary internal surface, can be applied for separation and determination of peroxycarboxylic acids to ultra-trace amounts. Thus, the first four homologous... 

The RP-HPLC method based on the CL reaction of luminol (124) catalyzed by Co(II) (Section in.B.2.c) can be applied for determination of peroxycarboxylic acids, esters and diacyl peroxides (see examples of LOD in equation 67, Section V.B.2.c) . The biosensor prepared according to equation 70, that is effective in the determination of hydroperoxides (Section V.B.6.b), becomes deactivated after three days of operation when trying to determine t-butyl peracetate. ... 

Upid hydroperoxide determination, 676 Methylenecyclohexene, final ozonide, 718 Methylenecyclopentene, final ozonide, 718 Methylene increment, peroxycarboxylic acids, 158... 

Oxidation of monocyclic 1,2,3-triazines with peroxycarboxylic acids afforded 1- (2) and/or 2-oxides (3).17,3fi 57,so 2+7 248 These iV-oxides could be separated by column chromatography and their structures determined by mass spectroscopy. All 1-oxidcs 2 showed an [M+-NJ peak of medium or high intensity, while the peak due to the molecular ion was weak or trace. On the other hand, the M+ peak was prominent and the [M+-N2] peak was absent for all 2-oxides 3. The jV-oxides could again be reduced to the 1,2,3-triazines by trivalent phosphorus compounds. 

Effkemann, S., Pinkernell, U., Neumuller, R., Schwan, F., EngeUiardt, H., and Karst, U., Liquid chromatographic simultaneous determination of peroxycarboxylic acids using postcolunm derivatiza-tion. Anal. Chem., 70, 3857-3862, 1998. 

The epoxidation reaction works with many alkenes, but it is slow with mono-substituted (terminal) alkenes. Why do terminal alkenes react more slowly with peroxycarboxylic acids The reaction rate (Chapter 7, Section 7.11) of two alkenes can be examined in order to determine if one is a stronger Lewis base. As a rule, the alkene best able to donate electrons should undergo epoxidation faster if the Lewis acid-base analogy is correct. Alkyl groups are electron releasing, and more alkyl substituents on a C=C unit lead to greater electron density in the 7i-bond, which makes that alkene a stronger Lewis base. 

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