نتایج جستجو برای: fluorine teceb
تعداد نتایج: 7204 فیلتر نتایج به سال:
It is a pleasure to introduce the 3rd in the series of Thematic Issues on organo-fluorine chemistry for the Beilstein Journal of Organic Chemistry (BJOC). These series have become progressively more successful over time in terms of the number and quality of the contributions received. It is also pleasing to note that the profile and impact factor of the journal has increased steadily over this ...
The chemical diffusion of fluorine in jadeite melt has been investigated from 10 to 15 kbars and 1200 to 14OO“C using diffusion couples of jadeite melt and fluorine-bearing jadeite melt (6.3 wt.% F). The diffusion profile data indicate that the diffusion process is concentration-independent, binarv. F-O interdiffision. The F-O interdiffusion coefficient ranges from 1.3 X IO-’ to 7.1 X lo-’ cm*/...
Introduction: This study presents first experimental results on the effect of fluorine on near-liquidus phase equilibria of an Adirondack-class Martian basalt. The basis of this study is our previous work on anhydrous [1] and chlorine bearing [2] systems which has already shown that: 1) the Adirondack-class basalts are evolved liquid compositions [1] and 2) that chlorine has a large effect on l...
We present a theoretical investigation of the chemistry of fluorine-bearing molecules in diffuse and dense interstellar gas clouds, combining recent estimates for the rates of relevant chemical reactions with a self-consistent model for the physical and chemical conditions within gas clouds that are exposed to the interstellar ultraviolet radiation field. The chemistry of interstellar fluorine ...
Fluorine-containing functional groups are important motifs influencing physical and biological properties of organic compounds. Visible-light photoredox catalysis as a powerful strategy for the activation small molecules contributed significantly to rapid progress new synthetic procedures allowing introduction fluorine atoms into substrates. In this review, we highlight distinct strategies tran...
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are a class of fluorinated organic chemicals containing at least one fully fluorinated carbon atom. The C-F bond is one of the strongest known covalent bonds, and the multiple C-F bonds in PFASs impart their chemical and thermal stability. The strength of the C-F bond arises, in part, from the electronegativity of the fluorine atom and from ...
After nitrogen, fluorine is probably the next most favorite hetero-atom for incorporation into small molecules in life science-oriented research. This review focuses on a particular fluorinated substituent, the trifluoromethoxy group, which is finding increased utility as a substituent in bioactives, but it is still perhaps the least well understood fluorine substituent in currency. The present...
Cage molecules have long been employed to trap reactive or transient species, as their rigid nature allows them to enforce situations that otherwise would not persist. In this Minireview, we discuss our use of rigid cage structures to investigate the close noncovalent interactions of fluorine with other functional groups and determine how mutual proximity affects both physical properties and re...
native stoichiometric oxide, TiO2, always present on the titanium surface, results in a non-reproducible induction time. During etching the surface of titanium is covered by a highly fluorinated layer which protects the metal by the reaction with oxygen. Chlorine is not able to remove the native oxide unless drastic conditions are realized, Once this layer is removed with fluorine, the reaction...
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