Abstract
1. The principal direction in the decomposition of the M+ ions of aminals comes down to rupture of C-N bonds, which may be accompanied by migration of the H atom to the charged and uncharged fragments. 2. Under conditions of chemical ionization in isobutane, these aminals give the ions [M + C4H9]+, [M+C3H7]+, [MH]+, [MH-HNC5H10]+, and [H2NC5H10]+. 3. The introduction of such substituents as Cl or MeO into the benzene ring of these aminals has little effect on the rate of decomposition of the MH+ ions, whereas the introduction of NO2 (particularly in the para position) lowers this rate to a considerable degree.
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