Selenium Tetraazide
Selenium tetraazide is an inorganic chemical compound with the formula . It is a highly sensitive explosive, and has been prepared directly from selenium tetrafluoride and trimethylsilyl azide. Properties Selenium tetraazide is a yellow solid which precipitates frequently due to its low solubility. The compound is very susceptible to combustion even at low temperatures, and was only found to be stable at -50 degrees Celsius. References azide selenium Selenium is a chemical element; it has symbol (chemistry), symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form. It seldom occurs in this elem ...

Selenium Tetrafluoride
Selenium tetrafluoride ( Se F4) is an inorganic compound. It is a colourless liquid that reacts readily with water. It can be used as a fluorinating reagent in organic syntheses (fluorination of alcohols, carboxylic acids or carbonyl compounds) and has advantages over sulfur tetrafluoride in that milder conditions can be employed and it is a liquid rather than a gas. Synthesis The first reported synthesis of selenium tetrafluoride was by Paul Lebeau in 1907, who treated selenium with fluorine Fluorine is a chemical element; it has Chemical symbol, symbol F and atomic number 9. It is the lightest halogen and exists at Standard temperature and pressure, standard conditions as pale yellow Diatomic molecule, diatomic gas. Fluorine is extre ...: :Se + 2 F2 → SeF4 A synthesis involving more easily handled reagents entails the fluorination of selenium dioxide with sulfur tetrafluoride: :SF4 + SeO2 → SeF4 + SO2 An intermediate in this reaction is seleninyl fluoride (SeOF2). ...
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Trimethylsilyl Azide
Trimethylsilyl azide is the organosilicon compound with the formula . A colorless liquid, it is a reagent in organic chemistry Organic chemistry is a subdiscipline within chemistry involving the science, scientific study of the structure, properties, and reactions of organic compounds and organic matter, organic materials, i.e., matter in its various forms that contain ..., serving as the equivalent of hydrazoic acid. Preparation Trimethylsilyl azide is commercially available. It may be prepared by the reaction of trimethylsilyl chloride and sodium azide: : Reactions The compound hydrolyzes to hydrazoic acid: : The compound adds to ketones and aldehydes to give the siloxy azides and subsequently tetrazoles: : It ring-opens epoxides to give azido alcohols. It has been used in the Oseltamivir total synthesis. Safety Trimethylsilyl azide is incompatible with moisture, strong oxidizing agents, and strong acids. Azides are often explosive, as illustrated by their u ...
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Selenium Compounds
Selenium compounds are compounds containing the element selenium (Se). Among these compounds, selenium has various oxidation states, the most common ones being −2, +4, and +6. Selenium compounds exist in nature in the form of various minerals, such as clausthalite, guanajuatite, tiemannite, crookesite etc., and can also coexist with sulfide minerals such as pyrite and chalcopyrite. For many mammals, selenium compounds are essential. For example, selenomethionine and selenocysteine are selenium-containing amino acids present in the human body. Selenomethionine participates in the synthesis of selenoproteins. The reduction potential and pKa (5.47) of selenocysteine are lower than those of cysteine, making some proteins have antioxidant activity. Selenium compounds have important applications in semiconductors, glass and ceramic industries, medicine, metallurgy and other fields. Chalcogen compounds and oxyacids Selenium forms two oxides: selenium dioxide (SeO2) and selenium triox ...
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