Mass spectra of aliphatic dicarboxylic acids and their dimethyl esters: Cyclic structures for the [M− H2O]+˙ ions from the diacids and [M− MeOH]+˙ ions from the …

…, R Kallury, UJ Krull, M Thompson

Index: Harrison, Alex. G.; Kallury, R. Krishna Mohan Rao; Krull, Ulrich J.; Thompson, Michael Organic Mass Spectrometry, 1988 , vol. 23, p. 723 - 728

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Abstract

Abstract Methyl 2-oxocycIoalkane carboxylate structures are proposed lor the [M− MeOH]+ ions from dimethyl adipate, pimelate, suberate and azelate. This proposal is based on a comparison of the metastable ion mass spectra and the kinetic energy releases for the major fragmentation reaction of these species with the same data for the molecular ions of authentic cyclic β-keto esters. The mass spectra of α, α, α′, α′-d 4-pimelic acid and its ...

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