Abstract
AbstractThe reactions of mass‐selected [CH3NH2]+˙ ions with the isomeric butenes and pentenes were studied at low collision energies in the radiofrequency‐only quadrupole collision cell of a hybrid BEqQ tandem mass spectrometer. Characteristic iminium ions arising by addition of the methylamine to the olefin followed by fragmentation are observed for but‐1‐ene pent‐1‐ene and 3‐methylbut‐1‐ene. However, for but‐2‐ene pent‐2‐ene 2‐methylpropene 2‐methylbut‐1‐ene and 2‐methylbut‐2‐ene the major reaction channel of [CH3NH2]+˙ is charge exchange to form the olefinic molecular ion. The isomeric olefins are characterized to a considerable extent by the characteristic ion–molecule reactions that these molecular ions undergo with the neutral olefin.
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