The mono- and dialkylcyclopentanes fragment in the same manner under electron impact.
The m/e 68 and 69 doublet is characteristic of the monoalkylcyclopentanes and can be used for their identification.
The mass spectra of the trans and cis isomers of the 1,3-dialkylcyclopentanes are identical. The spectra of the 1,2-substituted compounds differ in the intensities of the molecular ion and C4H8 + ion peaks.
The spectra of the structural isomers show clearcut differences in the intensities of the M+., [M-RH]+., and C5H7 + ion peaks which can be used in establishing substitution types.
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Al. A. Petrov, Chemistry of the Naphthenes [in Russian], Nauka (1971), Chap.1, p. 7.
P. Natalis, Bull. Soc. Chim. Belg.,66, 5 (1957);73, 560, 569 (1964).
J. Momigny and P. Natalis, Bull. Soc. Chim. Belg.,66, 26 (1957).
O. A. Aref'ev, V. A. Zakharenko, and Al. A. Petrov, Neftekhimiya,4, 505 (1966).
Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 1, pp. 68–73, January, 1979.
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Golovkina, L.S., Rusinova, G.V. & Petrov, A.A. Structural and stereochemecal factors in the mass spectrometry of the substituted cyclopentanes. 1. mono- and dialkylcyclopentanes. Russ Chem Bull 28, 58–62 (1979). https://doi.org/10.1007/BF00925398
- Mass Spectrometry
- Mass Spectrum
- Electron Impact
- Structural Isomer