scholarly journals SEPARATION OF URANIUM HEXAFLUORIDE FROM BROMINE AND BROMINE TRIFLUORIDE

1954 ◽  
Author(s):  
A Krakoviak
Keyword(s):  
Uranium Hexafluoride ◽  
Bromine Trifluoride

Recent Advances in the Synthesis of Acyl Fluorides

Synthesis ◽  
2020 ◽  
Author(s):  
Marie Gonay ◽  
Chloé Batisse ◽  
Jean-François Paquin
Keyword(s):  
Transition Metal ◽  
Organic Synthesis ◽  
Peptide Synthesis ◽  
Uranium Hexafluoride ◽  
Metal Catalysts ◽  
Recent Advances ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed ◽  
Nucleophilic Fluorination ◽  
Bromine Trifluoride

AbstractAcyl fluorides are valuable intermediates in organic synthesis. They are increasingly employed in peptide synthesis, in challenging esterification and amidation reactions or in transition-metal-catalyzed transformations. This review summarizes recent advances in their preparation.1 Introduction2 Nucleophilic Fluorination2.1 α-Fluoroamine Reagents2.2 Sulfur-Based Reagents2.3 Metal Catalysts2.4 Phosphorus-Based Reagents2.5 N,N′-Dicyclohexylcarbodiimide/HF·Pyridine2.6 Uranium Hexafluoride2.7 Bromine Trifluoride3 Radical Fluorination4 Conclusion

Intercalation of uranium hexafluoride into graphite

1985 ◽  
Vol 50 (4) ◽  
pp. 947-955 ◽  
Author(s):  
Karel Klouda ◽  
Václav Rak ◽  
Josef Vachuška
Keyword(s):  
Carbon Atom ◽  
Surface Area ◽  
Gaseous Phase ◽  
Uranium Hexafluoride ◽  
Graphite Particles ◽  
Fluorination Agent ◽  
Increasing Temperature ◽  
Elementary Fluorine

Intercalation of UF6 into graphite, both from the gaseous phase and from the Ledon 113 solution, was studied. The amount of intercalated UF6 from the gaseous phase was found to be inversely proportional to the size of graphite particles. Intercalation increases with the increasing temperature and surface area of graphite. The contact of gaseous UF6 with graphite led to the formation of β-UF5 that is not intercalated. In the Ledon solution, β-UF5 is not formed. "Passivation" of graphite by elementary fluorine also prevents the formation of β-UF5 but the amount of intercalated UF6 decreases. The intercalation of UF6 into graphite from the gaseous phase is accompanied by the increase of the distance between the parallel carbon atom layers up to the values of about 884 pm. Ternary intercalates graphite-UF6-Ledon 113 are formed during the intercalation of UF6 from the Ledon 113 solutions and the distance between the parallel carbon atom layers is 848-875 pm. Thermogravimetry in the presence of air revealed that the binary intercalates graphite-UF6 decompose in a 3-step reaction while the ternary intercalates decompose in a 4-step reaction. In both cases uranium hexafluoride is not released but acts as a fluorination agent on the graphite carbon.

Sign in / Sign up

Export Citation Format

Share Document