scholarly journals Identifying reactive intermediates by mass spectrometry

2020 ◽  
Vol 11 (44) ◽  
pp. 11960-11972
Author(s):  
Jaya Mehara ◽  
Jana Roithová
Keyword(s):  
Mass Spectrometry ◽  
Reactive Intermediates ◽  
Reaction Intermediates ◽  
Insight Into ◽  
Structure Properties

Modern approaches of mass spectrometry can identify reaction intermediates and provide a unique insight into their structure, properties and kinetics.

Study of short-lived and early reaction intermediates in organocatalytic asymmetric amination reactions by ion-mobility mass spectrometry

2016 ◽  
Vol 6 (17) ◽  
pp. 6637-6643 ◽  
Author(s):  
Jun-Ting Zhang ◽  
Hao-Yang Wang ◽  
Xiang Zhang ◽  
Fang Zhang ◽  
Yin-Long Guo
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Reactive Intermediates ◽  
Ion Mobility Mass Spectrometry ◽  
Reaction Intermediates ◽  
Early Reaction

A study of the reactive intermediates in organocatalytic asymmetric amination reactions by reactive SAESI coupled to ion-mobility mass spectrometry.

scholarly journals Direct time-resolved detection and quantification of key reactive intermediates in diethyl ether oxidation at T = 450–600 K

2020 ◽  
Vol 22 (42) ◽  
pp. 24649-24661
Author(s):  
Maria Demireva ◽  
Kendrew Au ◽  
Leonid Sheps
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Diethyl Ether ◽  
Vacuum Ultraviolet ◽  
Reactive Intermediates ◽  
Reaction Intermediates ◽  
Time Resolved ◽  
Photoionization Mass Spectrometry ◽  
Ionization Radiation ◽  
Detection And Quantification

High-pressure multiplexed photoionization mass spectrometry (MPIMS) with tunable vacuum ultraviolet (VUV) ionization radiation from the Lawrence Berkeley Labs Advanced Light Source is used to characterize and quantify key reaction intermediates in the oxidation of diethyl ether (DEE).

Speciation and decomposition pathways of ruthenium catalysts used for selective C–H hydroxylation

2014 ◽  
Vol 5 (8) ◽  
pp. 3309-3314 ◽  
Author(s):  
Cornelia Flender ◽  
Ashley M. Adams ◽  
Jennifer L. Roizen ◽  
Eric McNeill ◽  
J. Du Bois ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Metal Complex ◽  
Desorption Electrospray Ionization ◽  
Reactive Intermediates ◽  
Ruthenium Catalysts ◽  
Ionization Mass ◽  
Mechanistic Insight ◽  
Hydroxylation Reaction ◽  
Desi Ms ◽  
Insight Into

Mechanistic insight into the C–H hydroxylation reaction catalysed by [(Me3tacn)RuCl3] has been obtained using desorption electrospray ionization mass spectrometry (DESI-MS) to identify reactive intermediates and to determine the fate of the starting metal complex.

The Knoevenagel condensation catalysed by ionic liquids: a mass spectrometric insight into the reaction mechanism

2021 ◽  
Vol 45 (38) ◽  
pp. 17787-17795
Author(s):  
Chiara Salvitti ◽  
Martina Bortolami ◽  
Isabella Chiarotto ◽  
Anna Troiani ◽  
Giulia de Petris
Keyword(s):  
Mass Spectrometry ◽  
Ionic Liquids ◽  
Reaction Mechanism ◽  
Knoevenagel Condensation ◽  
Mass Spectrometric ◽  
Reaction Intermediates ◽  
Insight Into

Mass spectrometry was used to study the Knoevenagel condensation catalysed by imidazolium-based ionic liquids. Two pathways were highlighted by intercepting two different reaction intermediates: a base-catalysed and a carbene-catalysed mechanism.

scholarly journals The apple C2H2-type zinc finger transcription factor MdZAT10 positively regulates JA-induced leaf senescence by interacting with MdBT2

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Kuo Yang ◽  
Jian-Ping An ◽  
Chong-Yang Li ◽  
Xue-Na Shen ◽  
Ya-Jing Liu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Transcription Factor ◽  
Liquid Chromatography ◽  
Zinc Finger ◽  
Leaf Senescence ◽  
Transcriptional Activity ◽  
Molecular Mechanisms ◽  
Liquid Chromatography Mass Spectrometry ◽  
Zinc Finger Transcription Factor ◽  
Insight Into

AbstractJasmonic acid (JA) plays an important role in regulating leaf senescence. However, the molecular mechanisms of leaf senescence in apple (Malus domestica) remain elusive. In this study, we found that MdZAT10, a C2H2-type zinc finger transcription factor (TF) in apple, markedly accelerates leaf senescence and increases the expression of senescence-related genes. To explore how MdZAT10 promotes leaf senescence, we carried out liquid chromatography/mass spectrometry screening. We found that MdABI5 physically interacts with MdZAT10. MdABI5, an important positive regulator of leaf senescence, significantly accelerated leaf senescence in apple. MdZAT10 was found to enhance the transcriptional activity of MdABI5 for MdNYC1 and MdNYE1, thus accelerating leaf senescence. In addition, we found that MdZAT10 expression was induced by methyl jasmonate (MeJA), which accelerated JA-induced leaf senescence. We also found that the JA-responsive protein MdBT2 directly interacts with MdZAT10 and reduces its protein stability through ubiquitination and degradation, thereby delaying MdZAT10-mediated leaf senescence. Taken together, our results provide new insight into the mechanisms by which MdZAT10 positively regulates JA-induced leaf senescence in apple.

In situ loading of well-dispersed silver nanoparticles on nanocrystalline magnesium oxide for real-time monitoring of catalytic reactions by surface enhanced Raman spectroscopy

Nanoscale ◽  
2015 ◽  
Vol 7 (40) ◽  
pp. 16952-16959 ◽  
Author(s):  
Kaige Zhang ◽  
Gongke Li ◽  
Yuling Hu
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Catalytic Reactions ◽  
Reaction Intermediates ◽  
Reaction Conditions ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanocrystalline Magnesium Oxide ◽  
Insight Into

The surface-enhanced Raman spectroscopy (SERS) technique is of great importance for insight into the transient reaction intermediates and mechanistic pathways involved in heterogeneously catalyzed chemical reactions under actual reaction conditions, especially in water.

The main reasons for substance formation and natural process manifestation

2021 ◽  
pp. 76-96
Author(s):  
Alexander Likhachev
Keyword(s):  
Thermodynamic Parameters ◽  
World History ◽  
Natural Process ◽  
Natural Materials ◽  
Main Factors ◽  
Composition Structure ◽  
The Impact ◽  
Insight Into ◽  
Structure Properties

Natural materials and processes represent the global substance reflecting and determining its formation and existence as a whole and in all its components. Revealing the reasons for their formation and manifestation is crucial. The paper highlights the two main factors: «influences» and «gradients». Influences are interpreted as the impact of some substances and events on other similar parameters, and gradients are vector changes and differences in systems composition, structure, properties, states, energy and thermodynamic parameters. To provide an insight into the role and significance of the above factors and reasons, an attempt was made to consider their potential manifestation throughout the general world history within the existing knowledge about it.

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