Results 301 to 310 of about 1,577,920 (354)

Gas-Phase Dissociation Chemistry of Deprotonated RGD

Journal of the American Society for Mass Spectrometry, 2020
We investigate the structure and dissociation pathways of the deprotonated amphoteric peptide arginylglycylasparic acid, [RGD-H]-. We model the pertinent gas-phase structures and fragmentation chemistry of the precursor anions and predominant sequence-informative bond cleavages (b2+H2O, c2, and z1 peaks) and compare these predictions to our tandem mass
Jordan M. Rabus   +6 more
openaire   +4 more sources

Dissociation Chemistry of 3-Oxetanone in the Gas Phase

The Journal of Physical Chemistry A, 2017
3-Oxetanone is a strained cyclic molecule which plays an important role in synthetic chemistry. A few studies exist in the literature about the equilibrium properties of this molecule and the dissociation patterns of substituted 3-oxetanones. For the unsubstituted 3-oxetanone, formation of ketene (CH2CO) and formaldehyde (HCHO) was considered to be the
Sumitra Godara   +2 more
openaire   +4 more sources

Theoretical investigation of the dissociation chemistry of formyl halides in the gas phase

Physical Chemistry Chemical Physics, 2020
Halogen substituted analogues of formaldehyde, HXCO (X = F, Cl, Br, and I), play a crucial role in the degradation of stratospheric ozone.
Anchal Gahlaut, Manikandan Paranjothy
openaire   +4 more sources

Sequence Ion Structures and Dissociation Chemistry of Deprotonated Sucrose Anions

Journal of the American Society for Mass Spectrometry, 2018
We investigate the tandem mass spectrometry of regiospecifically labeled, deprotonated sucrose analytes. We utilize density functional theory calculations to model the pertinent gas-phase fragmentation chemistry of the prevalent glycosidic bond cleavages (B1-Y1 and C1-Z1 reactions) and compare these predictions to infrared spectroscopy experiments on ...
Bythell, Benjamin   +4 more
openaire   +5 more sources

The dissociation chemistry of permethylated guanosines as articulated by MS/MS

Tetrahedron Letters, 1993
Abstract Permethylation of covalently modified guanosines is shown to be an effective means of increasing the abundance of structurally significant fragment ions when protonated base ions from nucleosides are subjected to collision-induced dissociation in MS/MS.
John M. Gregson, James A. McCloskey
openaire   +3 more sources

Dissociation of the Ethyl Radical: An Exercise in Computational Chemistry

Journal of Chemical Education, 2014
A set of exercises for use in a typical physical chemistry laboratory course are described, modeling the unimolecular dissociation of the ethyl radical to form ethylene and atomic hydrogen. Students analyze the computational results both qualitatively and quantitatively.
Patrick E. Fleming   +2 more
openaire   +3 more sources

Intriguing roles of reactive intermediates in dissociation chemistry of N-phenylcinnamides

Organic & Biomolecular Chemistry, 2012
In mass spectrometry of protonated N-phenylcinnamides, the carbonyl oxygen is the thermodynamically most favorable protonation site and the added proton is initially localized on it. Upon collisional activation, the proton transfers from the carbonyl oxygen to the dissociative protonation site at the amide nitrogen atom or the α-carbon atom, leading to
Ziming Xia   +5 more
openaire   +4 more sources

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