transfer reactions
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Author(s):  
Sina Shahi ◽  
Hossein Roghani-Mamaqani ◽  
Richard Hoogenboom ◽  
Saeid Talebi ◽  
Hanieh Mardani

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Yujing Guo ◽  
Chao Pei ◽  
Rene M. Koenigs

AbstractNitrene transfer reactions represent one of the key reactions to rapidly construct new carbon-nitrogen bonds and typically require transition metal catalysts to control the reactivity of the pivotal nitrene intermediate. Herein, we report on the application of iminoiodinanes in amination reactions under visible light photochemical conditions. While a triplet nitrene can be accessed under catalyst-free conditions, the use of a suitable photosensitizer allows the access of a nitrene radical anion. Computational and mechanistic studies rationalize the access and reactivity of triplet nitrene and nitrene radical anion and allow the direct comparison of both amination reagents. We conclude with applications of both reagents in organic synthesis and showcase their reactivity in the reaction with olefins, which underline their markedly distinct reactivity. Both reagents can be accessed under mild reaction conditions at room temperature without the necessity to exclude moisture or air, which renders these metal-free, photochemical amination reactions highly practical.


2022 ◽  
Author(s):  
Nava Reznik ◽  
Annastassia D. Gallo ◽  
Katherine W. Rush ◽  
Gabriel Javitt ◽  
Yael Fridmann-Sirkis ◽  
...  

Mucus protects the body by many mechanisms, but a role in managing toxic transition metals was not previously known. Here we report that secreted mucins, the major mucus glycoproteins coating the respiratory and intestinal epithelia, are specific copper-binding proteins. Most remarkably, the intestinal mucin, MUC2, has two juxtaposed copper binding sites, one that accommodates Cu2+ and the other Cu1+, which can be formed in situ by reduction with vitamin C. Copper is an essential trace metal because it is a cofactor for a variety of enzymes catalyzing electron transfer reactions, but copper damages macromolecules when unregulated. We observed that MUC2 protects against copper toxicity while permitting nutritional uptake into cells. These findings introduce mucins, produced in massive quantities to guard extensive mucosal surfaces, as extracellular copper chaperones and potentially important players in physiological copper homeostasis.


2022 ◽  
Author(s):  
Sandip Das ◽  
Kulbir kulbir ◽  
Soumyadip Ray ◽  
Tarali Devi ◽  
Somnath Ghosh ◽  
...  

Small molecule activation & their transfer reactions in biological or catalytic reactions are greatly influenced by the metal-centers and the ligand frameworks. Here, we report the metal-directed nitric oxide (NO)...


2021 ◽  
pp. 269-297
Author(s):  
Hai‐Xu Wang ◽  
Vanessa K.‐Y. Lo ◽  
Chi‐Ming Che

Author(s):  
Jingjing Li ◽  
Gen Zhang ◽  
Xinrui Zhang ◽  
Yuhai Zhang ◽  
Zhong Liu ◽  
...  

Abstract The production cross sections of unknown neutron-rich transuranium isotopes of elements Np, Pu, Am and Cm are investigated in multinucleon transfer reactions based on the dinuclear system model with GEMINI code. The influence of the incident energy on the production of neutron-rich transuranium nuclei in actinideactinide collisions is studied. The calculation results show that the final isotopic production cross sections are larger at 1.06-1.10 Vcont than at other energies. Considering the high fissility of transuranium nuclides, 1.06 Vcont is chosen as the optimal incident energy. The N/Z ratio equilibration mechanism in the nucleon transfer process is also studied in this work. The larger difference of N/Z ratio between projectile and target corresponds to larger neutron diffusion during the nucleon exchange process. The 238U beam with high N/Z ratio and neutron-rich actinide targets are good selections to produce neutron-rich transuranium nuclides. The production cross sections of unknown neutron-rich transuranium isotopes 245-249Np, 248-251Pu, 248-254Am, and 252-254Cm are predicted in 238U-induced actinide-based (249Bk, 249Cf, and 252Cf) multinucleon transfer reactions. It is found that a large number of these unknown neutron-rich transuranium nuclei could be generated at the level of nb to µb in the reactions 238U+249Bk and 238U+252Cf. Our research indicates that the reaction 238U+249Bk is a suitable projectile-target combination in the current experimental conditions and the reaction 238U+252Cf could be a promising candidate to produce unknown neutron-rich transuranium nuclides in case that the 252Cf target were to be achieved in the future.


ChemSusChem ◽  
2021 ◽  
Author(s):  
Bing Yan ◽  
Changxia Shi ◽  
Gregg T. Beckham ◽  
Eugene Y.-X. Chen ◽  
Yuriy Román

ACS Catalysis ◽  
2021 ◽  
pp. 442-452
Author(s):  
Ayan Dasgupta ◽  
Emma Richards ◽  
Rebecca L. Melen

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