Premium
Reactive collisions in quadrupole cells. Part I. Reaction of [CH 3 NH 2 ] + ˙ with the isomeric butenes and pentenes
Author(s) -
Usypchuk Laurie L.,
Harrison Alex. G.,
Wang Jianyao
Publication year - 1992
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210270703
Subject(s) - methylamine , chemistry , ene reaction , ion , fragmentation (computing) , iminium , quadrupole , molecule , olefin fiber , mass spectrometry , polyatomic ion , medicinal chemistry , physics , atomic physics , catalysis , organic chemistry , chromatography , computer science , operating system
The reactions of mass‐selected [CH 3 NH 2 ] + ˙ 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 [CH 3 NH 2 ] + ˙ 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.