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- W1993772122 abstract "Disubstituted trialkyloxonium ions R1OCH2O+(R1)CH2OR2 (R1, R2 = CH3 or C2H5) have been prepared by chemical ionization of dimethoxy- and diethoxymethane individually or as a mixture, and their fragmentation has been studied by means of metastable ion and collision-induced dissociations. It is found that when a methoxymethyl group is attached to the charged oxygen atom, the oxonium ions can fragment by C-O bond cleavage to generate a methoxymethyl cation/dialkoxymethane ion-neutral complex, in which methyl cation transfer occurs to expel neutral formaldehyde. When an ethoxymethyl group is connected with the central oxygen atom, a reaction channel involving loss of C2H4O is observed and found to be insensitive to collisions. This process is proposed to involve isomerization prior to fragmentation leading to methylated dialkoxymethanes coordinated with neutral acetaldehyde in ion-neutral complexes; these ion-neutral complexes are estimated to be 35 kJ mol−1 more stable than the original oxonium ions." @default.
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- W1993772122 date "1999-05-01" @default.
- W1993772122 modified "2023-10-17" @default.
- W1993772122 title "Fragmentation of substituted oxonium ions: The role of ion-neutral complexes" @default.
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- W1993772122 doi "https://doi.org/10.1016/s1044-0305(99)00004-5" @default.
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