Recent advances in mass spectrometry-based structural elucidation techniques

X Ma - Molecules, 2022 - mdpi.com
Mass spectrometry (MS) has become the central technique that is extensively used for the
analysis of molecular structures of unknown compounds in the gas phase. It manipulates the …

Binding of saturated and unsaturated C 6-hydrocarbons to the electrophilic anion [B 12 Br 11]−: a systematic mechanistic study

X Ma, M Rohdenburg, H Knorke, S Kawa… - Physical Chemistry …, 2022 - pubs.rsc.org
The highly reactive gaseous ion [B12Br11]− is a metal-free closed-shell anion which
spontaneously forms covalent bonds with hydrocarbon molecules, including alkanes …

4a Nucleophilic Aromatic Substitution

MR Crampton - Organic Reaction Mechanisms 2020, 2024 - Wiley Online Library
Analogies between the mechanisms of electrophilic substitution and nucleophilic
substitution have been discussed. Theoretical calculations, involving aromaticity …

Gas-Phase Reactivity of Quinoline-Based Singlet Oxenium Cations

X Ma, RO Anyaeche, E Feng, E Johnson… - The Journal of …, 2024 - ACS Publications
Isomeric quinolyloxenium cations were generated in the gas phase in an ion trap mass
spectrometer to explore their reactions. The structures of some products were identified via …

Heat-or light-induced acylarylation of unactivated alkenes towards 3-(α-acyl) indolines

Y Li, F Ying, T Fu, R Yang, Y Dong, L Lin… - Organic & …, 2020 - pubs.rsc.org
A heat-or photoredox/iron dual catalysis-enabled dehydrogenative acylarylation of N-allyl
anilines leading to 2-substituted 3-(α-acyl) indolines with a quaternary stereogenic center is …

Effects of the Distance between Radical Sites on the Reactivities of Aromatic Biradicals

D Ding, H Jiang, X Ma, JJ Nash… - The Journal of Organic …, 2020 - ACS Publications
Coupling of the radical sites in isomeric benzynes is known to hinder their radical reactivity.
In order to determine how far apart the radical sites must be for them not to interact, the gas …

Protonated Ground-State Singlet meta-Pyridynes React from an Excited Triplet State

X Ma, E Feng, H Jiang, VM Boulos, J Gao… - The Journal of …, 2021 - ACS Publications
The gaseous 2, 6-didehydropyridinium cation and its derivatives transfer a proton to
reagents for which the reaction for their singlet ground states is too endothermic to be …

Differentiation of Seven Isomeric n-Pentylquinoline Radical Cations Based on Energy-Resolved Medium-Energy Collision-Activated Dissociation

Y Zhang, W Li, H Lei, X Dong… - Journal of the American …, 2022 - ACS Publications
Asphaltenes, a major and undesirable component of heavy crude oil, contain many different
types of large aromatic compounds. These compounds include nitrogen-containing …

Reactivity of para-benzynes in solution and in the gas phase

C Jin, E Feng, X Ma, W Tang, H Sheng, A Wittrig… - Tetrahedron …, 2021 - Elsevier
To rationally design less cytotoxic synthetic drugs based on biologically active para-benzyne
intermediates, it is essential to obtain a better understanding on the reactivity of para …

Spin‐Spin Coupling Controls the Gas‐Phase Reactivity of Aromatic σ‐Type Triradicals

D Ding, E Feng, RR Kotha… - … A European Journal, 2022 - Wiley Online Library
Examination of the reactions of σ‐type quinolinium‐based triradicals with cyclohexane in the
gas phase demonstrated that the radical site that is the least strongly coupled to the other …