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Why calcium hydride is used as a reducing agent in organic synthesis?

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Author : Lzh
Update time : 2023-02-17 13:16:19
What is calcium hydride?
Calcium hydride is a common chemical reagent with a chemical formula of CaH2 and a molecular weight of 42.10. Grayish white crystal or block, easily deliquescent, used as a reducing agent, desiccant, chemical analysis reagent, etc.; It is also a colorless rhombic crystal; Industrial products are gray, orthorhombic, or powder. Sensitive to moisture. It does not react with dry air, nitrogen, and chlorine at normal temperatures. Still, it can react with the above gases at high temperatures to generate calcium oxide, calcium carbide, and calcium chloride, respectively. It can also react with ethanol to generate hydrogen and calcium ethoxide. The reduction of metal oxides is stronger than that of sodium hydride or lithium hydride.
Properties of calcium hydride
Colorless rhombic crystal; Industrial products are gray, orthorhombic, or powder. Sensitive to moisture. Relative density 1. 70. The melting point is 816 (in hydrogen). It is decomposed into Ca and H2 at 600 . It does not react with dry air, nitrogen, and chlorine at normal temperatures. Still, it can react with the above gases at high temperatures to generate calcium oxide, calcium carbide, and calcium chloride, respectively. It can also react with ethanol to generate hydrogen and calcium ethoxide. The reduction of metal oxides is stronger than that of sodium hydride or lithium hydride.
 
Preparation of calcium hydride
Put the refined calcium with a purity of about 99.5% into the iron plate and put it in the center of the quartz reaction tube. Install the inlet and outlet pipe at the two ends of the quartz reaction tube with rubber plugs, respectively, and introduce purified hydrogen from the inlet pipe. The outlet pipe is connected to the fume hood through the mineral oil bubbler. An electric furnace heats the reaction tube. The purified hydrogen is initially filled with a large amount of hydrogen to replace the reaction system's air, then heated by an electric furnace. The reaction starts at about 200 and is heated to 250~300 . The reaction is carried out by introducing hydrogen at a flow rate of 0.6 mL/min, which can be completed after about 2 hours. The calcium hydride produced is a porous gray-white crystalline powder, and the purity of calcium hydride is about 99%.
 
Price of calcium hydride
Calcium hydride particle size and purity will affect the product's price, and the purchase volume can also affect the cost of calcium hydride. A large amount of large amount will be lower. The price of calcium hydride can be found on our company's official website.
 
Calcium hydride supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including calcium hydride, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective calcium hydride, you are welcome to contact us or inquire at any time.
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