Chemical Structure / July 20, 2018 / Serena Calhoun
Beryllium oxide is used in many high-performance semiconductor parts for applications such as radio equipment because it has good thermal conductivity while also being a good electrical insulator. It is used as a filler in some thermal interface materials such as thermal grease. Some power semiconductor devices have used beryllium oxide ceramic between the silicon chip and the metal mounting base of the package to achieve a lower value of thermal resistance than a similar construction of aluminium oxide.
Berberine is a cationic alkaloid that was first isolated in 1917 from goldenseal (Hydrastis canadensis), a North American herb of the buttercup family. It is found in the roots, rhizomes, stems, and bark of many other plants, including Berberisspp. (worldwide), yellowroot (Southwestern United States), and the Amur cork tree (East Asia). It usually exists as the chloride, but T. Kametani and co-workers reported the total synthesis as the iodide in 1969.
Acetyl chloride is produced in the laboratory by the reaction of acetic acid with chlorodehydrating agents such as PCl3, PCl5, SO2Cl2, phosgene, or SOCl2. However, these methods usually gives acetyl chloride contaminated by phosphorus or sulfur impurities, which may interfere with the organic reactions.
Phosphorus pentachloride is the chemical compound with the formula PCl5. It is one of the most important phosphorus chlorides, others being PCl3 and POCl3. PCl5 finds use as a chlorinating reagent. It is a colourless, water-sensitive and moisture-sensitive solid, although commercial samples can be yellowish and contaminated with hydrogen chloride.
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