A
Asher Mandelbaum
Researcher at Technion – Israel Institute of Technology
Publications - 121
Citations - 6804
Asher Mandelbaum is an academic researcher from Technion – Israel Institute of Technology. The author has contributed to research in topics: Chemical ionization & Collision-induced dissociation. The author has an hindex of 18, co-authored 121 publications receiving 6526 citations.
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Journal ArticleDOI
Propellanes 100. The Nature of the Stereoelectronic Effect in the Highly Stereospecific Hydroxyl Elimination from syn, anti-[4.3.3]Propellane-8,11-diol upon Isobutane Chemical Ionization†
Pnina Ashkenazi,Bruno Domon,Arie L. Gutman,Asher Mandelbaum,D. Müller,W. J. Richter,D. Ginsburg +6 more
TL;DR: This paper showed that the syn-hydroxyl group preferentially lost from the syn, anti-title diol upon i-C4H10 chemical ionization, indicating occurrence of a stereoelectronic effect in this process.
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On the fragmentation of stereoisomeric substituted cyclohexylamines under electron impact. Comparison with corresponding alcohols and ethers
TL;DR: In this paper, it was shown that the stereospecific elimination of H2O and CH3OH from substituted cyclohexanols and their methyl ethers upon electron impact is not reproduced in the corresponding amines.
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Structural assignment of isomeric 2‐(2‐quinolinyl)‐1H‐indene‐1,3(2H)‐dione mono‐ and disulfonic acids by liquid chromatography electrospray and atmospheric pressure chemical ionization tandem mass spectrometry
TL;DR: Mechanistic pathways, involving interactions between adjacent groups, are proposed for the above regiospecific fragmentations of the isomeric acids.
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The effect of steric hindrance on the relative rates of anchimerically assisted alcohol eliminations from MH+ ions of 2-substituted 1,4-dialkoxybutanes upon CI and CID: Experiment and theory
TL;DR: In this article, a concerted mechanistic pathway for alcohol elimination from 1,4-dialkoxybutanes was proposed, and the results showed that the energies of transition states resulting in 4-elimination products are lower than those leading to the elimination of alcohol from position 1, and this tendency increases with the increase of the bulkiness of the 2-substituents.
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Configurational assignment of fragment ions by CID. Stereochemistry and mechanism of retro-Diels–Alder fragmentation accompanied by hydrogen transfer in gas-phase cations
TL;DR: The low energy CID mass spectra of m/z 173, C8H13O4+, obtained from the diethyl ester of cis,syn,cis-l,2,3,3a,4,5,5a,6,7,8,8a,9,10,10a-dodecahydrophenanthrene-9, 10-dicarboxylic acid indicate that the formation of this ion from both precursors takes place by migration of a hydrogen atom from an allylic �