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The spectra of eighteen cymantrene derivatives are reported and discussed. Fragmentation patterns are suggested and substantiated by the use of metastable peaks wherever such have been observed. The presence of the metal atom in many of the fragment ions observed appears to play an important role in determining stability and subsequent fragmentation paths of these ions. This is illustrated by the observation of several intramolecular rearrangements, involving the metal atom.

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The elimination of H,O from the molecular ions of trans-4-and trans-3-arylcyclohexanols takes place to a greater extent than in the corresponding cis isomers. The remarkable differences in abundance, taken together with substituent effects and the results of deuterium labelling, show that configuration is retained in the molecular ions which undergo the elimination, and that this process is a cis-l,4 and cis-l,3 elimination in the trans-4and trans-3-arylcyclohexanols, respectively. Possible mechanisms for the elimination in the cis isomers are discussed.