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The Simons process, named after Joseph H. Simons entails electrolysis of a solution of an organic compound in a solution of hydrogen fluoride. An individual reaction can be described as: R 3 C–H + HF → R 3 C–F + H 2. In the course of a typical synthesis, this reaction occurs once for each C–H bond in the precursor.
Fluoride therapy is the use of fluoride for medical purposes. [2] Fluoride supplements are recommended to prevent tooth decay in children older than six months in areas where the drinking water is low in fluoride. [3] It is typically used as a liquid, pill, or paste by mouth. [4] Fluoride has also been used to treat a number of bone diseases. [5]
[18] [39] The first organofluorine compound was discovered in 1835, when Dumas and Péligot distilled dimethyl sulfate with potassium fluoride and got fluoromethane. [39] [40] In 1862, Alexander Borodin pioneered a now-common method of halogen exchange: he acted on benzoyl chloride with potassium bifluoride and first synthesized benzoyl fluoride.
The fluoride salt-cooled high-temperature reactor (FHR), also called advanced high temperature reactor (AHTR), [29] is also a proposed Generation IV molten-salt reactor variant regarded promising for the long-term future. [25] The FHR/AHTR reactor uses a solid-fuel system along with a molten fluoride salt as coolant.
Dr. Dean's research on the fluoride-dental caries relationship, published in 1942, included 7,000 children from 21 cities in Colorado, Illinois, Indiana, and Ohio. The study concluded that the optimal amount of fluoride which minimized the risk of severe fluorosis but had positive benefits for tooth decay was 1 mg per day, per adult.
Here’s what to know about College Application Week in North Carolina. List of colleges participating in College Application Week 2023 The following colleges are participating in College ...
More practically and like most metal fluorides, it is prepared by treating the corresponding chloride with hydrogen fluoride: [7] FeCl 3 + 3 HF → FeF 3 + 3 HCl. It also forms as a passivating film upon contact between iron (and steel) and hydrogen fluoride. [8] The hydrates crystallize from aqueous hydrofluoric acid. [6] The material is a ...
Multiple studies have shown silver(I) fluoride to be an effective anti-caries agent, although the mechanism is the subject of current research. [27] Treatment is typically by the "atraumatic" method, in which 40% by mass aqueous silver(I) fluoride solution is applied to carious leisons, followed by sealing of the dentine with glass ionomer ...