Molybdenum Nitride Complexes with Ph3SiO Ligands Are Exceedingly Practical and Tolerant Precatalysts for Alkyne Metathesis and Efficient Nitrogen Transfer Agents

2009 ◽  
Vol 131 (27) ◽  
pp. 9468-9470 ◽  
Author(s):  
Martin Bindl ◽  
Robert Stade ◽  
Eike K. Heilmann ◽  
Alexandre Picot ◽  
Richard Goddard ◽  
...  
Keyword(s):  
Nitrogen Transfer ◽  
Molybdenum Nitride ◽  
Alkyne Metathesis ◽  
Transfer Agents

Towards nitrogen transfer catalysis: reactive lattice nitrogen in cobalt molybdenum nitride

2007 ◽  
pp. 3051 ◽  
Author(s):  
David Mckay ◽  
Duncan H. Gregory ◽  
Justin S. J. Hargreaves ◽  
Stuart M. Hunter ◽  
Xiaoling Sun
Keyword(s):  
Nitrogen Transfer ◽  
Molybdenum Nitride ◽  
Cobalt Molybdenum Nitride

scholarly journals Recent Advances in the Catalytic Asymmetric Reactions of Oxaziridines

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2656 ◽  
Author(s):  
Qiao Ren ◽  
Wen Yang ◽  
Yunfei Lan ◽  
Xurong Qin ◽  
Youzhou He ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Asymmetric Reactions ◽  
Nitrogen Transfer ◽  
Asymmetric Transformations ◽  
Recent Advances ◽  
Broad Array ◽  
Catalytic Asymmetric ◽  
Transfer Agents ◽  
Catalytic Asymmetric Reactions

Oxaziridines have emerged as powerful and elegant oxygen- and nitrogen-transfer agents for a broad array of nucleophiles, due to the remarkably high and tunable reactivities. However, the asymmetric catalysis involving oxaziridines is still in its infancy. Herein, this review aims to examine recent advances in the catalytic asymmetric transformations of oxaziridines, including oxidation, amination, cycloaddition and deracemization.

Well-defined silica-supported molybdenum nitride species: silica grafting triggers alkyne metathesis activity

2013 ◽  
Vol 4 (6) ◽  
pp. 2680 ◽  
Author(s):  
Marie Genelot ◽  
Nicolas P. Cheval ◽  
Marta Vitorino ◽  
Elise Berrier ◽  
Jean-Marc Weibel ◽  
...  
Keyword(s):  
Molybdenum Nitride ◽  
Alkyne Metathesis

Synthesis of Conjugated Triynes via Alkyne Metathesis

2019 ◽  
Author(s):  
Idriss Curbet ◽  
Sophie Colombel-Rouen ◽  
Romane Manguin ◽  
Anthony Clermont ◽  
Alexandre Quelhas ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
High Selectivity ◽  
Alkyne Metathesis ◽  
Cross Metathesis ◽  
Synthetic Strategy ◽  
Sterically Hindered ◽  
Site Selective

<div> <div> <div> <div> <p>The synthesis of conjugated triynes by molybdenum-catalyzed alkyne metathesis is reported. Strategic to the success of this approach is the utilization of sterically-hindered diynes that allowed for the site- selective alkyne metathesis to produce the desired con- jugated triyne products. The steric hindrance of alkyne moiety was found to be crucial in preventing the for- mation of diyne byproducts. This novel synthetic strategy was amenable to self- and cross-metathesis providing straightforward access to the corresponding symmetrical and dissymmetrical triynes with high selectivity. </p> </div> </div> </div> </div>

Researching nitrogen solubility in nitrogen-containing austenitic steels at melting and recrystallization by CALPHAD method

2019 ◽  
pp. 53-66 ◽  
Author(s):  
L. A. Smirnov ◽  
I. I. Gorbachev ◽  
V. V. Popov ◽  
A. Yu. Pasynkov ◽  
A. S. Oryshchenko ◽  
...  
Keyword(s):  
Global Minimum ◽  
Nitrogen Solubility ◽  
Thermodynamic Description ◽  
Solidus Temperature ◽  
Liquidus Line ◽  
Calphad Method ◽  
Austenitic Steels ◽  
Nitrogen Transfer ◽  
Fixed Nitrogen ◽  
System Phase

The CALPHAD method has been employed to compose thermodynamic description of the Fe–Cr–Mn–Ni–Si–C–N system. Using an algorithm based on finding a global minimum of Gibbs energy, the calculations of system phase composition were performed in the temperature range from 1750°C to hardening and in the range of compositions corresponding to 04Kh20N6G11M2AFB steel. Calculations showed that at temperatures above liquidus line, Cr and Mn increase nitrogen solubility in the melt, while Ni and Si reduce it. With an increase in the content of Cr, Mn, Ni, and Si in steel in the studied composition range, both liquidus and solidus temperature decrease. The degree of influence on these temperatures of Cr, Mn, Ni and Si within the steel grade is different and ranges from ~3 to ~14°C. Calculations taking into account the possibility of nitrogen transfer between steel and the atmosphere of air showed that the amount of fixed nitrogen in the alloy under study varies, depending on the composition of the steel and temperature, from ~0.3 to ~0.6 wt%. As the temperature decreases from liquidus to solidus, the amount of fixed nitrogen increases, with the exception of those steel compositions when ferrite and not austenite is released from the liquid phase.

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