Magnesium Bromide; CAS 7789 -48-2

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Purity
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Product Description

Magnesium bromide;CAS 7789-48-2

Magnesium Bromide; CAS 7789-48-2
 
Magnesium bromide Chemical Properties
Melting point  711 °C (lit.)
Boiling point  1248.47°C (estimate)
density  3.72 g/mL at 25 °C (lit.)
form  Powder
color  off-white
Specific Gravity 3.72
Water Solubility  g/100g H2O: 100.6 (25°C), 125.4 (100°C); solid phase, MgBr2 ·6H2O [KRU93]
Merck  13,5681
Stability: hygroscopic
CAS DataBase Reference 7789-48-2(CAS DataBase Reference)
NIST Chemistry Reference Magnesium dibromide(7789-48-2)
EPA Substance Registry System Magnesium bromide (MgBr2) (7789-48-2)
 
Safety Information
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  26-36
WGK Germany  1
HS Code  28275900
Magnesium bromide Usage And Synthesis
Occurrence and Uses Magnesium bromide occurs in sea water, surface and subterranean brines, and salt deposits. It is an electrolyte component in certain dry cells. In medicine, it is a sedative and anticonvulsant for treatment of nervous disorder. It also is used in organic synthesis forming several addition compounds.
Physical Properties The anhydrous MgBr2 is a white crystalline substance; hexagonal crystals; deliquescent; density 3.72 g/cm3; melts at 700°C; highly soluble in water (101.5g/100mL at 20°C); moderately soluble in meth anol and ethanol (21.8 and 6.9 g/mL at 20°C, respectively).
The hexahydrate, MgBr2•6H2O consists of colorless monoclinic crystals; bitter taste; hygroscopic; fluoresce in x-rays; density 2.07 g/cm3; melts at 172.4°C; intensely soluble in water, 316 g/100 mL at 0°C; dissolves in met hanol and ethanol; slightly soluble in am monia solution.
Preparation Magnesium bromide is prepared by treating magnesium oxide with hydrobromic acid and subsequent crystallization above 0°C. The product is hexahydrate, MgBr2•6H2O:
MgO + 2HBr → MgBr2 + H2O
The anhydrous MgBr2 may be obtained by heating the hexahydrate with dry hydrogen bro mide gas. Magnesium bromide also can be made from its elements. Heating magnesium metal with brom ine vapor yields the salt:
Mg + Br2 → MgBr2
Magnesium bromide, like the chloride salt, is obtained from sea water (see Magnesium and Magnesium chloride). In this process, magnesium hydroxide precipitated from sea water is neutralized with hydrobromic acid, and MgBr2 is obtained by crystallization.
Chemical Properties Colorless, very deliquescent crystals; bitter taste. Soluble in water; slightly soluble in alcohol.
Chemical Properties Magnesium Bromide is a white solid, soluble, formed by reaction of magnesium carbonate and hydrobromic acid.
Occurrence Magnesium bromide is found in seawater, some mineral springs, natural brines, inland seas and lakes such as the Dead Sea and the Great Salt Lake, and salt de posits such as the Stassfurt deposits. In seawater, it is the primary source of bro mine. By the action of chlo rine gas upon seawater or seawater bitterns, brom ine is formed.
Uses Magnesium Bromide is an inorganic salt used in the synthesis of superconductors and nanowires. Also present in polymer nanocomposites to improve conductivity.
Uses The major use of MgBr2 has been in the commercial production of brom ine. The Dow process is an electrolytic method of brom ine extraction from brine, and was Herbert Dow's second revolutionary process for generating brom ine commercially (1889).
Magnesium bromide has also been used in organic syntheses. An efficient and environmentally friendly procedure for the one-pot synthesis of tetrahydropyrimidines from aldehydes, a-diketones and urea/thiou rea by using magnesium bromide as an inexpensive and easily available catalyst under solvent-free conditions has been described. Compared with the classical Biginelli reaction conditions, this new method has the advantage of good to excellent yields (74%-94%) and short reaction times (45-90 min). The structure of the Biginelli reaction product from a-diketone, salicylaldehyde and urea has been proposed to possess an oxygen bridge by cyclization (intramolecular Michael addition).
Uses Organic syntheses, medicine (sedative).
Preparation Magnesium bromide is prepared by treating MgO with hydrobromic acid and then crystallization above 0.0°C in solution. The product is the hexahydrate salt:
MgO+2HBr→MgBr2+H2O→MgBr2·6H2O
The anhydrous form may also be prepared by heating the hexahydrate with dry HBr gas. This compound can also be formed directly from the elements:
Mg+Br2→MgBr2
Purification Methods Crystallise it from EtOH or H2O (3.3g/mL). Dry it in a vacuum at ~150o, or heat the hydrate in a stream of HCl. It is very deliquescent. [Ehrlich in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 909 1963.]
 
Magnesium Bromide; CAS 7789-48-2
 
 
Magnesium Bromide; CAS 7789-48-2 Magnesium Bromide; CAS 7789-48-2 Magnesium Bromide; CAS 7789-48-2
Company Informations:

Hunan Yunbang Pharmaceutical Co., Ltd. ( Yunbangpharm) located in Changsha High-tech Industrial Park, Hunan. It is a high-tech enterprise specializing in the research and development, production and sales of Pharmaceutical raw materials, Pharmaceutical intermediates(API) and Fine chemicals. Based in China, Yunbangpharm has been providing suitable solutions for many domestic,foreign pharmaceutical companies and traders. Excellent quality, good reputation and authentic price have won the praise of the majority of customers.
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Organic Intermediate