OH˙ loss and molecular rearrangements of quinoxaline N??oxides studied by interpretation of mass spectra and application of linear discriminant analysis

M Bartoszek, D Salzwedel, G Stumm…

Index: Bartoszek, M.; Salzwedel, D.; Stumm, G.; Niclas, H.-J. Organic Mass Spectrometry, 1987 , vol. 22, p. 259 - 268

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Citation Number: 8

Abstract

Abstract Quinoxaline N-oxides substituted at the ortho position to the NO group give characteristic [M–OH]+ fragments. With the di-N-oxides the peak intensities depend on the electron-withdrawing strength of the 2-and 3-substituents. Linear discriminant analysis was used to study the fragmentation of quinoxaline N-oxides as determined by the number of NO groups. Results of peak selection and discriminant analysis (Fisher quotients and ...