Abstract
Abstract The 14-membered diacetal dilactam ring 1 undergoes, at low pH and under fast-cesium ions bombardment, a substitution of its two acetal methoxy groups by a single molecule of glycerol (matrix) whereas near-neutral pH conditions lead only to protonation of the compound. The ability of compound 1 to complex alkali metal ions has been used for the comparison of the reactivities of its protonated and cationized forms under collisional activation. The unexpected loss of methane from the cationized methoxyls is the main fragmentation channel of the alkali metal complex ions.
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