Optimized production of the acylium diagnostic ions in the chemical ionization NO+ mass spectra of long‐chain monoolefins

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Abstract
A recent reinvestigation of the reactivity of NO+ towards straight‐chain monoolefinic compounds revealed that the characteristic acylium ions, previously reported for alkenyl acetates and related compounds, could also be obtained from alkenes and alkenoic acids (or esters). In this study, the influence of the sample pressure and that of NO on the production of the acylium ions was investigated, leading to disappearance graphs indicative of a strong dependence on these experimental factors. This gives a further explanation for previous apparent discrepancies in the literature and the optimum conditions of use for double‐bond location in a variety of substituted or unsubstituted monoolefins.