STRUCTURAL AND STEREOCHEMICAL FACTORS IN THE MASS-SPECTROMETRY OF THE SUBSTITUTED CYCLOPENTANES .1. MONOALKYLCYCLOPENTANES AND DIALKYLCYCLOPENTANES

1. The mono- and dialkylcyclopentanes fragment in the same manner under electron impact. 2. The m/e 68 and 69 doublet is characteristic of the monoalkylcyclopentanes and can be used for their identification. 3. 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. 4. 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. © 1979 Plenum Publishing Corporation.