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A computer screen showing a background wallpaper photo of the Palace of Versailles. A wallpaper or background (also known as a desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, smartphone or other electronic device.
It can be prepared by reacting beryllium metal with elemental bromine at temperatures of 500 °C to 700 °C: [1]. Be + Br 2 → BeBr 2. When the oxidation is conducted on an ether suspension, one obtains colorless dietherate: [4]
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Barium bromide is a precursor to chemicals used in photography and to other bromides. Historically, barium bromide was used to purify radium in a process of fractional crystallization devised by Marie Curie.
Structures of Tetrahalodiboranes. Tetrahalodiboranes are a class of diboron compounds with the formula B 2 X 4 (X = F, Cl, Br, I). These compounds were first discovered in the 1920s, [1] but, after some interest in the middle of the 20th century, were largely ignored in research.
Boron tribromide is commercially available and is a strong Lewis acid.. It is an excellent demethylating or dealkylating agent for the cleavage of ethers, also with subsequent cyclization, often in the production of pharmaceuticals.