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Structures and formation of ions

Several ion isomers yield characteristic and distinguishable collisional activation spectra: and/or (a-b), (c) and [cyclobutane]+ (e), while the collisional activation spectrum of (d) could also arise from a combination of a-b and c. Although ready isomerization may occur for ions of higher internal energy, such as d or e a, b, and/or c, the isomeric product ions identified from many precursors are consistent with previously postulated rearrangement mechanisms. 1,4-Eliminations of HX occur in 1-alkanols and, in part, 1-buthanethiol and 1-bromobutane. The collisional activation data are consistent with a substantial proportion of 1,3-elimination in 1- and 2-chlorobutane, although 1,2-elimination may also occur in the latter, and the formation of the methylcycloprpane ion from n-butyl vinyl ether and from n-butyl formate. Surprisingly, cyclohexane yields the ions a-b, not , e.