Magnesium compound

Aryl mesylates are used for the Ni-catalysed cross-coupling with Grignard, organozinc and organoboron reagents [100]. 

Disagreement exists about the position of the minimum of the lowest conduction band. Some authors place the minimum at Fi and anticipate a direct gap others claim that the minimum is at X3, indicating an indirect gap. 

Magnesium selenide MgSe 4.05 300 Zinc blende structure 

Magnesium telluride MgTe 3.49 RT Epitaxial films, photoluminescence, zinc blende structure 

Electronic Transport, General Description. Magnesium Oxide (MgO). Electrical transport measurements on alkaline earth oxides encounter several difficulties, such as high resistance at low temperatures, a strong influence of surface layers, and high-temperature thermionic emission. The partly contradictory results depend considerably on the purity and nature of the samples (pressed porous powders, sintered samples, polycrystals, and single crystals) and on the experimental conditions. 

As in several semiconducting oxides, the conductivity and the t5fpe of conduction are determined by the oxygen partial pressure of the ambient atmosphere. In high-purity MgO crystals, temperatures below 1600 K favor ionic conduction, whereas at temperatures above 2000 K, electronic conduction is increasingly predominant. At low oxygen pressures ( 10 mbar) the conduction is n-type at high pressures ( 10 mbar) ionic and electronic hole conduction seem to be superimposed. 

Crystal Structure, Mechanical and Thermal Properties Tables 4.1-105-4.1-111. 

Magnesium oxide Magnesium sulfide Magnesium selenide Magnesium telluride 

---

Add 4 0 g. (4 0 ml.) of pure anihne dropwise to a cold solution of ethyl magnesium bromide (or iodide) prepared from 1 Og. of magnesium, 5 0 g. (3-5 ml.) of ethyl bromide (or the equivalent quantity of ethyl iodide), and 30 ml. of pure, sodium-dried ether. When the vigorous evolution of ethane has ceased, introduce 0 02 mol of the ester in 10 ml. of anhydrous ether, and warm the mixture on a water bath for 10 minutes cool. Add dilute hydrochloric acid to dissolve the magnesium compounds and excess of aniline. Separate the ethereal layer, dry it with anhydrous magnesium sulphate and evaporate the ether. Recrystallise the residual anihde, which is obtained in almost quantitative yield, from dilute alcohol or other suitable solvent. 

Organolithium and -magnesium compounds. Compared with extensive studies carried out on the Ni-catalyzed transmetallation reaction of Grignard reagents[43I,432], few examples of the Pd-catalyzed reactions of Mg are... 

Anhydrous diethyl ether is the customary solvent used when preparing organo magnesium compounds Sometimes the reaction does not begin readily but once started It IS exothermic and maintains the temperature of the reaction mixture at the boiling point of diethyl ether (35°C)... 

---