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- W2070102020 abstract "Protonated molecules of a variety of benzyl diethers, produced by chemical ionization (CI), undergo a unique rearrangement yielding relatively abundant m/z 181 C14H13+ ions, both in the ion source and under collision-induced dissociation (CID) conditions. This highly general rearrangement involves an intramolecular C–C bond formation between the two benzyl groups, and the resulting C14H13+ ions have been shown by the analysis of their CID spectra to be an almost equimolar mixture of isomeric α-o-tolylbenzyl, α-p-tolylbenzyl and p-benzylbenzyl cation structures in all cases. This structural information suggests that this process may be viewed as gas-phase aromatic substitution of the non-charged benzyloxy group by the benzyl cation originating from the protonated ether function involving a series of π- (and/or ion–neutral) and σ-complexes. The extent of this fragmentation in alkane benzyl diethers PhCH2O(CH2)nOCH2Ph (n = 2–10,12) is strongly affected by the alkane chain length. Stereoisomeric benzyl diethers display an unusual steric effect: the trans-isomers give rise to more abundant C14H13+ ions than their cis-counterparts. The latter two effects are explained in terms of intramolecular hydrogen bonding between the two alkoxy groups. Bis(benzyloxy)benzenes and -naphthalenes exhibit very low abundance C14H13+ ions in contrast to the aliphatic analogues. This behavior is attributed to competing intramolecular benzylation involving the aromatic skeletons of these compounds." @default.
- W2070102020 created "2016-06-24" @default.
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- W2070102020 date "1999-01-01" @default.
- W2070102020 modified "2023-09-27" @default.
- W2070102020 title "Intramolecular benzyl–benzyl interactions in protonated benzyl diethers in the gas phase. Effects of internal hydrogen bonding" @default.
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- W2070102020 doi "https://doi.org/10.1039/a901622h" @default.
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