Search results for "adipic acid"
showing 4 items of 14 documents
A fast method for determining low-molecular-mass aliphatic carboxylic acids by high-performance liquid chromatography–atmospheric pressure chemical i…
2006
A fast quantitative high-performance liquid chromatographic separation method with atmospheric pressure chemical ionization mass spectrometric detection (HPLC-APCI-MS) was developed for the determination of low-molecular-mass aliphatic mono- and dicarboxylic acids typically present in different industrial process waters. A mixture of glycolic, lactic, a-glucoisosaccharinic, oxalic, maleic, fumaric, succinic, malic, glutaric, methylsuccinic, and adipic acids was separated using an RP chromatographic system. Adipic acid was used as an internal standard to calculate correlation coefficients for the acids studied. The chromatographic analysis of these acids was primarily carried out by means of…
Strukturuntersuchung von polyestern durch direkten abbau im massenspektrometer, 2. Aliphatische polyester
1976
Die Abbaureaktionen von Polyestern aus Adipinsaure und Athylenglykol 1a, Tetradeuteroathylenglykol 1b, 1,3-Propandiol 1c und 2,2′-Oxydiathanol 1d sowie aus Bernsteinsaure und Athylenglykol 2a, 1,4-Butandiol 2b und 2,2-Dimethyl-1,3-propandiol 2c wurden im Massenspektrometer untersucht. Die Polymeren wurden direkt in der Ionenquelle des Massenspektrometers pyrolysiert und die entstehenden thermischen Bruchstukke durch Elektronenstos ionisiert und fragmentiert. Die Pyrolyse- und Fragmentierungsreaktionen lassen sich nebeneinander nachweisen. Die Kenntnis der Mechanismen beider Abbauschritte ermoglicht es, strukturisomere Polyester zu unterscheiden. The degradation reactions of polyesters of ad…
Cyclic esters of aliphatic diacids with pyrocatechol and hydroquinone
1985
Cyclic esters of adipic acid, suberic acid and sebacic acid were prepared by reaction of the acid dichlorides and pyrocatechol or hydroquinone in benzene under high dilution conditions. While only the cyclic dimers could be obtained from hydroquinone, pyrocatechol formed cyclic monomers as well as cyclic dimers (and also a cyclic dimer with succinic acid). The structure of all compounds was confirmed by1H-NMR- and mass spectra. The crystal structures of the pyrocatechol esters were determined by single crystal X-ray analysis.
ChemInform Abstract: Cyclic Esters of Aliphatic Diacids with Pyrocatechol and Hydroquinone.
1986
Cyclic esters of adipic acid, suberic acid and sebacic acid were prepared by reaction of the acid dichlorides and pyrocatechol or hydroquinone in benzene under high dilution conditions. While only the cyclic dimers could be obtained from hydroquinone, pyrocatechol formed cyclic monomers as well as cyclic dimers (and also a cyclic dimer with succinic acid). The structure of all compounds was confirmed by1H-NMR- and mass spectra. The crystal structures of the pyrocatechol esters were determined by single crystal X-ray analysis.