Magnesium powder, compound

The alkaline earth metals can be detected in burning compounds by the colors that they give to flames. Calcium burns orange-red, strontium crimson, and barium yellow-green. Fireworks are often made from their salts (typically nitrates and chlorates, because the anions then provide an additional supply of oxygen) together with magnesium powder. 

Kupec et al. [180] determined total sulphur in sludge by a method involving magnesium reduction in which the sample is heated with magnesium powder to convert all sulphur compounds into magnesium sulphide. The magnesium sulphide is treated with sulphuric acid and the evolved hydrogen sulphide determined by iodometric titration. 

Charcoal and sulfur were the earliest pyrotechnic fuels. The choice of fuels is very wide, ranging from metallic to non-metallic elements and binary compounds to various types of carbonaceous materials, both natural and synthetic. The main fuels are aluminum and magnesium powders, their alloy, sulfur, lactose, carbon and carbonaceous fuels etc. The fuels listed below are usually powdered materials, which when oxidized provide heat energy. 

For volatile or unstable nitrogen compounds, a mixture consisting of 138 parts of ignited potassium carbonate and 72 parts of magnesium powder may be used in place of sodium (or potassium). Small quantities of this mixture and of the compound are intimately mixed and heated in a glass t.ube. The mass is extracted with water, filtered, the filtrate made alkaline and tested for cyanide. 

The presence of phosphorus may also be ascertained by heating the compound with magnesium powder, and moistening the cold product with water, whereby phosphine (recognised by its smell) is liberated from the magnesium phosphide. . ... 

By this method, which had formerly been employed only for the alkali metals and iron, the magnesium derivative, Mg(C5H6)2, has recently been prepared in the vapor phase. Cyclopentadiene vapor was passed over magnesium powder at 500-600° and under suitable conditions crystals of mp 176° were obtained (4). Thallium and indium reacted similarly with cyclopentadiene vapor at 350°, giving the compounds TlCsHs and InCgH (55). Attempts to develop a more general method of preparation from cyclopentadiene and molten metals met with no success 121). 

Only one aryl compound is knowm, namely, magnesium diphenyl, formed by heating magnesium powder and mercury diphenyl at 200° C. in an atmosphere of nitrogen. Like the alkyl compounds, it is readily oxidisable in air and decomposed by water. 

Its halogen is not directly precipitated by silver nitrate, but with magnesium powder in ethereal solution it forms the magnesium compound in 60 per cent, yield. 

The reaction of magnesium powder, activated by a small amount of alkylbromide, with anthracene in THF at 20-60°C over 24 h, leads to an orange compound [Mg(anthracene)(THF)3], which forms catalysts with anhydrous transition metal chlorides. ... 

A general method makes use of Barbier conditions combined with ultrasonication. The organic halide, RX, bis(tributyltin) oxide, and magnesium powder are caused to react in THF, in the presence of 1,2-dibromoethane, in an ultrasonic cleaning bath at about 35 °C for one hour.16 The presence of a surface-active compound in the bath assists cavitation. The reactions proceed in good yield with alkyl, vinyl, allyl, benzyl, aryl, and heteroaryl halides (usually bromides). 

The enamino group of the 4-aminoindole compound shown in Eq. 11 was carried out by a similar methodology using magnesium powder in methanol. ... 

Ultrasound was used [35] for a one-pot (though not one-step) preparation of the etherate of triethylaluminium in 80% yield a mixture of bromoethane, aluminium and magnesium powders was irradiated with ultrasound and ethyl-aluminium sesquibromide was formed. As soon as diethyl ether was introduced into the reaction medium, ethylmagnesium bromide was formed which reacted in situ with the aluminium compound to yield triethylaluminium etherate. 

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