Abstract
1. 1. Mass-spectra of 33 methyl-, dimethyl- and ethyl-substituted bicyclo[3.2.1]octane geomers were studied. 2. 2. Main trends of the breakdown of M + ions of bicyclo[3.2.1]octanes are due to bond ruptures at tertiary and quaternary carbon atoms. These ruptures are often accompanied by the migration of hydrogen atoms. 3. 3. Some agreement between the relative thermodynamic stability of stereo-isomers of a given structure and their resistance to electron impact was established. 4. 4. “Unfavourable” interactions of substituents with each other and with the system of bicyclo [3.2.1] octane determine the main directions of breakdown of molecular ions, while methyl substituents are retain d in neutral or charged fragments.
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