Summary
Electron impact mass spectra of seven 2,3-dihydro-5-trifluoromethyl/methyl-7-(p-R-phenyl)-1,4-diazepinesR=H, CH3, OCH3, CF3, Cl, Br) have been recorded and are discussed. These systems dissociate by scission of the C2-C3 bond followed by loss of H. to give the [M-H]+ ion as the base peak. The fragmentation behaviour has been investigated using metastable scanning techniques and accurate mass measurements. The origin of some characteristic fragment ions is discussed.
Zusammenfassung
Die EI-Massenspektren von 7 2,3-Dihydro-5-trifluormethyl/methyl-7-(p-R-phenyl)-1,4-diazepinen (R=CH3, OCH3, CF3, Cl, Br) werden vorgestellt. Diese Verbindungen fragmentieren unter Spaltung der C2-C3-Bindung. Anschließende Abspaltung von H. führt zum Fragment [M-H]+, das als Basispeak auftritt. Das Fragmentierungsverhalten wurde mittels metastabiler Methoden und genauer Massenbestimmungen untersucht. Die Herkunft einiger charakteristischer Fragmentionen wird diskutiert.
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References
Staab H, Wunsche C (1965) Chem Ber98: 3479
Lloyd D, McNab H, Marshall DR (1977) Aust J Chem30: 365
Hamdi ST, Ahmed KY (1993) Canadian J Applied Spectrosc38: 82
Salman SR, Hamdi ST, Ahmed KY (1986) Canad J Spectrosc31: 127
Sadee W (1970) J Med Chem13: 475
Benz W, Vane FM, Rapp U (1979) Org Mass Spectrom14: 154
Cook RG, Beynon JH, Caprioli RM, Lester GR (1973) Metastable Ions. Elsevier, Amsterdam
Fraefel A, Seibl J (1985) Mass Spectrom Rev4: 151
Vane FM, Benz W (1979) Org Mass Spectrom14: 233
Beynon JH, Saunders RA, Williams AE (1968) The Mass Spectra of Organic Molecules. Elsevier, Amsterdam
Levsen K (ed) (1978) Fundamental Aspects of Organic Mass Spectrometry. New York, p 119
Kwon BM, Kim SC (1983) J Chem Soc Perkin Trans II, 761
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Hamdi, S.T., Ahmed, K.Y. The mass spectral fragmentation of some 2,3-dihydro-5-trifluoromethyl-7-(p-R-phenyl)-1,4-diazepines. Monatsh Chem 127, 1013–1019 (1996). https://doi.org/10.1007/BF00807572
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DOI: https://doi.org/10.1007/BF00807572