Bifunctional even-electron ions. V. Fragmentation behaviour of aliphatic hydroxonium ions containing an additional cyano group
作者:U. I. Záhorszky、P. Schulze
DOI:10.1002/oms.1210240908
日期:1989.9
AbstractThe fragmentation behaviour of a series of bifunctional hydroxonium ions C2H5C(\documentclassarticle}\pagestyleempty}\begindocument}$ \mathop \rm O}\limits^ + \rm H} $\enddocument})(CH2)n‐CN (n = 0‐6), a n, has been investigated by electron impact mass spectrometry. The type of interaction‐induced reactions depend strongly on the chain distance between the oxonium and the cyano moiety, but the initial step in all cases is proton transfer from the hydroxy to the cyano group. The following selective primary fragmentations have been found: loss of C NH (HCN) from a 0, loss of CH2, C NH from a 1, loss of HNCO from a 2‐a 4, loss of CH3CHC O from a 4‐a 6, and loss of CO from a3. In addition, loss of NH3 and H2O, respectively, are observed as general fragmentations, except for the lowest homologues (a 0 and a 1). Mechanistic pathways of the selective reactions have been deduced with the aid of metastable ion spectra, high resolution, deuterium labelling and comparison of metastable ion spectra with those of independently generated ions.