Magnesium, addition with

Organic compounds normally cause Htde or no corrosion of magnesium. Tanks or other containers of magnesium alloys are used for phenol [108-95-2] methyl bromide [74-96 ] and phenylethyl alcohol [60-12-8]. Most alcohols cause no more than mild attack, but anhydrous methanol attacks magnesium vigorously with the formation of magnesium methoxide [109-88-6]. This attack is inhibited by the addition of 1% ammonium sulfide [12135-76-1] or the presence ofwater. 

Fig. 7.8. High temperature conversion of a-silicon nitride with an MgO additive to the p-pha.se is thought to be a consequence of dissolution of the a phase in a magnesium silicate with subsequent recrystallization from the melt. Enhanced dissolution rate should then strongly influence a. p conversion [84B01].

Kost et al. studied the interaction of indole magnesium iodide with a number of cyclic anhydrides of dibasic organic acids.In addition to 254 the following. 3-indolyloxo acids were prepared in this manner -(3-indolyl)-8-oxovaleric acid (274), y-(3-indolyl)-y-oxocrotoiiic acid... 

The high diastereoselectivity which is found in the nucleophilic addition of Grignard reagents to chiral 2-0x0 acetals can be explained by a chelation-controlled mechanism. Thus, coordination of the magnesium metal with the carbonyl oxygen and the acetal moiety leads to a rigid structure 3A in the transition state with preferred attack of the nucleophile occurring from the S/-side. 

The enolate geometry can be controlled, in the case of esters, by the addition of HMPA without HMPA the enolate has predominantly the. E-geometry, while with HMPA mainly Z-geometry is observed. Similar additions with magnesium and zinc enolates are observed24"32 373 374. 

It was previously reported that magnesium oxide with a moderate basicity formed reactive surface carbonate species, which reacted with carbon deposited on foe support by foe methane decjomposition [6]. Upon addition of Mg to foe Ni/HY catalyst, reactive carbonate was formed on magnesium oxide and carbon dioxide could be activated more easily on the Mg-promoted Ni/HY catal t. Reactive carbonate species played an important role in inhibiting foe carbon deposition on the catalyst surface. 

Recently, attempts were made to replace the air- and moisture-sensitive zinc and magnesium reagents in the copper-catalysed asymmetric conjugate addition, with... 

The flammability and explosive hazard of ferrosilicon powder is increased substantially during grinding in a vibratory mill [1], Explosion hazards from air-hydrogen,—acetylene, or—propane mixtures formed during preparation of ferrosilicon containing alkaline earth additives are attributed to contact of barium or magnesium carbide or silicide additive with atmospheric moisture [2],... 

Magnesium concentration = 0-600 m-mole/1 Chloride concentration = 50-500 m-mole/1 Chloride-to-magnesium ratio with magnesia additive = 0.1-1.2 mole/mole Slurry flow rate = 20, 30, or 40 gpm/ft ... 

The propensity of magnesium amide to undergo Michael additions with a,/S-unsaturated esters has been developed into a general protocol using homochiral amide to give magnesium /3-aminoenolate intermediates (equation 40). 

Polypropylene compositions containing magnesium hydroxide, with and without magnesium stearate surface treatment, were characterised at low and high shear rates using dynamic and capillary measurement techniques [36]. A significant reduction in viscosity was observed when surface treatment was present, particularly at low shear rates. In addition, with this system, the yield stress for the onset of flow was markedly reduced (Compare magnesium hydroxide variants A and E in Fig. 9). 

---