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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

12 Issues per year

IMPACT FACTOR 2016: 0.631

CiteScore 2017: 0.68

SCImago Journal Rank (SJR) 2017: 0.277
Source Normalized Impact per Paper (SNIP) 2017: 0.394

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Volume 28, Issue 7-8


Massenspektrometrische Untersuchungen an Borchelaten der Pyridin- und Chinolin-Reihe und deren N-Oxiden / Mass Spectrometric Investigations on Boron Chelates of the Pyridine and Quinoline Type and their N-Oxides

Eberhard Hohaus / Wolfgang Riepe
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-1973-7-810

Mass spectra of chelate-6-rings (N-oxide-chelates) are similar to those of comparable chelate-5-rings after elimination of oxygen from the fragment ion (M-C6H5). It is assumed that the fragment ion [(M-C6H5)-O] exists as a five-membered ring.

However, there are two exceptions which are: The diphenyl boron chelate of pyridine-2-carboxylic acid anilide N-oxide with O-B-O-coordination and the difluorine boron chelate of 8-hydroxyquinoline N-oxide. The stable fragment OBX (X = C6H5F) is eliminated directly from the fragment ion (M-X). It is assumed the ring closure in [(M-X)-O] obviously is less favoured. The preparation of both 5-ring-chelates using the components is impossible, too.

Keywords: Mass spectrometry; boron chelates; pyridine; quinoline

About the article

Received: 1973-03-19

Published Online: 2014-06-02

Published in Print: 1973-08-01

Citation Information: Zeitschrift für Naturforschung B, Volume 28, Issue 7-8, Pages 440–445, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-1973-7-810.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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