scholarly journals Revisiting the effect of f ‐functions in predicting the right reaction mechanism for hypervalent iodine reagents

2020 ◽  
Author(s):  
Tian‐Yu Sun ◽  
Kai Chen ◽  
Huakang Zhou ◽  
Tingting You ◽  
Penggang Yin ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Hypervalent Iodine ◽  
The Right

scholarly journals Brønsted Base-Mediated Aziridination of 2-Alkyl-Substituted-1,3-Dicarbonyl Compounds and 2-Acyl-Substituted-1,4-Dicarbonyl Compounds by Iminoiodanes

2017 ◽  
Vol 70 (4) ◽  
pp. 430 ◽  
Author(s):  
Ciputra Tejo ◽  
Davin Tirtorahardjo ◽  
David Philip Day ◽  
Dik-Lung Ma ◽  
Chung-Hang Leung ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Hypervalent Iodine ◽  
Atmospheric Conditions ◽  
Dicarbonyl Compounds ◽  
Brønsted Base

The synthesis of α,α-diacylaziridines and α,α,β-triacylaziridines from reaction of 2-alkyl-substituted-1,3-dicarbonyl compounds and 2-acyl-substituted-1,4-dicarbonyl compounds with arylsulfonyliminoiodinanes (ArSO2N=IPh) under Brønsted base-mediated atmospheric conditions is described. The reaction mechanism is thought to involve the formal oxidation of the substrate followed by aziridination of the ensuing α,β-unsaturated intermediate by the hypervalent iodine(iii) reagent.

scholarly journals Predicting the Right Mechanism for Hypervalent Iodine Reagents by Applying Two Types of Hypervalent Twist Models:Apical Twist and Equatorial Twist

2021 ◽  
Author(s):  
Tian-Yu Sun ◽  
Kai Chen ◽  
Qihui Lin ◽  
Ting-Ting You ◽  
Peng-gang Yin
Keyword(s):  
Reductive Elimination ◽  
Reaction Pattern ◽  
Hypervalent Iodine ◽  
Mechanistic Studies ◽  
General Reaction ◽  
The Right

Since the hypervalent twist followed by reductive elimination is a general reaction pattern for hypervalent iodine reagents, mechanistic studies about the hypervalent twist step could provide significant guidance for experiments....

Make room for iodine: systematic pore tuning of multivariate metal–organic frameworks for the catalytic oxidation of hydroquinones using hypervalent iodine

2018 ◽  
Vol 8 (17) ◽  
pp. 4349-4357 ◽  
Author(s):  
Babak Tahmouresilerd ◽  
Patrick J. Larson ◽  
Daniel K. Unruh ◽  
Anthony F. Cozzolino
Keyword(s):  
Pore Size ◽  
Catalytic Oxidation ◽  
Metal Organic Frameworks ◽  
Hypervalent Iodine ◽  
Multivariate Approach ◽  
Metal Organic ◽  
The Right

A multivariate approach has been to to establish the right balance between iodine loading and pore size for catalytic oxidative dearomatizations in MIL-53 (Al) and UiO-66 (Zr) MOFs.

On the reaction mechanism of an endoperoxide ring formation by fumitremorgin B endoperoxidase. The right arrangement makes a difference

2019 ◽  
Vol 48 (43) ◽  
pp. 16211-16221
Author(s):  
Anna Miłaczewska ◽  
Tomasz Borowski
Keyword(s):  
Reaction Mechanism ◽  
Active Site ◽  
Ring Formation ◽  
The Right

Computations suggest how the substrate binds within the active site and what is the mechanism of an endoperoxide ring formation.

scholarly journals Hydrogenolysis of glycerol over Pt/C catalyst in combination with alkali metal hydroxides

2016 ◽  
Vol 14 (1) ◽  
pp. 279-286 ◽  
Author(s):  
Jian Feng ◽  
Wei Xiong ◽  
Hao Ding ◽  
Bai He
Keyword(s):  
Reaction Mechanism ◽  
Alkali Metal ◽  
Surface Reaction ◽  
Reaction Process ◽  
Lithium Ions ◽  
Metal Hydroxides ◽  
Alkali Metal Hydroxides ◽  
Selective Hydrogenolysis ◽  
The Right ◽  
Main Factor

AbstractThe hydrogenolysis of glycerol was performed over a Pt/C catalyst in combination with several alkali metal hydroxides and their salts. LiOH was found to be an effective promoter for the selective hydrogenolysis of glycerol to 1,2-propanediol. Hydroxyl ions are the main factor to promote the reaction process by dehydration of the glyceraldehyde intermediate. Lithium ions play a role in assisting the dehydrogenation of glycerol to glyceraldehyde, because they have the right size to coordinate with the alkoxide species. A possible surface reaction mechanism involving the participation of lithium ions was proposed to account for the results obtained in the study.

scholarly journals Gold-catalyzed domino cyclization–alkynylation reactions with EBX reagents: new insights into the reaction mechanism

2017 ◽  
Vol 46 (36) ◽  
pp. 12257-12262 ◽  
Author(s):  
Hossein Ghari ◽  
Yifan Li ◽  
Roohollah Roohzadeh ◽  
Paola Caramenti ◽  
Jerome Waser ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Hypervalent Iodine ◽  
Domino Reactions

New insights into the mechanism of gold-catalyzed domino reactions with hypervalent iodine reagents revealed by computation and confirmed by experiments.

Investor-State Dispute Settlement under NAFTA Chapter 11: The Shape of Things to Come?

1998 ◽  
Vol 35 ◽  
pp. 263-290
Author(s):  
J. Anthony VanDuzer
Keyword(s):  
Free Trade Agreement ◽  
Dispute Settlement ◽  
Trade Agreement ◽  
Minimum Standards ◽  
The North ◽  
State Behaviour ◽  
Nafta Chapter 11 ◽  
To Come ◽  
The Right

SummaryRecently, there has been a proliferation of international agreements imposing minimum standards on states in respect of their treatment of foreign investors and allowing investors to initiate dispute settlement proceedings where a state violates these standards. Of greatest significance to Canada is Chapter 11 of the North American Free Trade Agreement, which provides both standards for state behaviour and the right to initiate binding arbitration. Since 1996, four cases have been brought under Chapter 11. This note describes the Chapter 11 process and suggests some of the issues that may arise as it is increasingly resorted to by investors.

What face familiarity feelings say about the lateralization of specific entities within the core system

2019 ◽  
Vol 42 ◽  
Author(s):  
Guido Gainotti
Keyword(s):  
Temporal Lobe ◽  
Memory System ◽  
Core System ◽  
The Core ◽  
Memory Traces ◽  
Specific Memory ◽  
Target Article ◽  
Temporal Structures ◽  
The Right

Abstract The target article carefully describes the memory system, centered on the temporal lobe that builds specific memory traces. It does not, however, mention the laterality effects that exist within this system. This commentary briefly surveys evidence showing that clear asymmetries exist within the temporal lobe structures subserving the core system and that the right temporal structures mainly underpin face familiarity feelings.

Study of charge transfer in FeTi

1983 ◽  
Vol 41 ◽  
pp. 296-297
Author(s):  
J. Taft∅
Keyword(s):  
Charge Transfer ◽  
Charge Distribution ◽  
Electron Scattering ◽  
Periodic System ◽  
Electron Distribution ◽  
Scattering Amplitude ◽  
Transition Elements ◽  
Hartree Fock ◽  
Cscl Structure ◽  
The Right

It is well known that for reflections corresponding to large interplanar spacings (i.e., sin θ/λ small), the electron scattering amplitude, f, is sensitive to the ionicity and to the charge distribution around the atoms. We have used this in order to obtain information about the charge distribution in FeTi, which is a candidate for storage of hydrogen. Our goal is to study the changes in electron distribution in the presence of hydrogen, and also the ionicity of hydrogen in metals, but so far our study has been limited to pure FeTi. FeTi has the CsCl structure and thus Fe and Ti scatter with a phase difference of π into the 100-ref lections. Because Fe (Z = 26) is higher in the periodic system than Ti (Z = 22), an immediate “guess” would be that Fe has a larger scattering amplitude than Ti. However, relativistic Hartree-Fock calculations show that the opposite is the case for the 100-reflection. An explanation for this may be sought in the stronger localization of the d-electrons of the first row transition elements when moving to the right in the periodic table. The tabulated difference between fTi (100) and ffe (100) is small, however, and based on the values of the scattering amplitude for isolated atoms, the kinematical intensity of the 100-reflection is only 5.10-4 of the intensity of the 200-reflection.

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