Mass spectra of some deuterium labelled dimethylquinolines

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Abstract
The mass spectra of several dimethylquinolines, labelled in the methyl group with deuterium, have been examined. The results are in agreement with the formation of ring-expanded molecular ions prior to fragmentation to the M—H and M—CH3 ions. Two ring-expanded ions may form since there are two methyl groups which can participate in the ring expansion process. Ring expansion through a methyl group located on the benzenoid ring is favored over ring expansion through a methyl group on the pyridine ring.

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