Magnesium chloride 5 molar

Dissolved chloride molarity less than 1.4 times that of magnesium... 

The production of PC from urea and 1,2-propanediol has also been performed, in a batch process, using zinc chloride and magnesium chloride [230], Under optimal reaction conditions (ethanol urea molar ratio 4, catalyst concentration 1.5%, reaction temperature 333 K, reaction time 3h), both MgCl2 and ZnCl2 showed excellent catalytic activity towards PC synthesis, with the yields reaching 96.5% and 92.4%, respectively. 

Methyl magnesium chloride (3.0 Molar solution in THF, 790 mmol) was added dropwise over 30 min to the CeCI3 slurry at 0°C. After stirring 2 hours, the mixture was cooled to -5°C and a toluene (600 mL) solution of the ethyl 2-(3(S)-(3-(2-(7-chloro-2-quinolinyl)ethenyl)phenyl)-3-hydroxy-propyl)benzoate (152 mmol) was added dropwise over 1 hour. The reaction mixture was stirred another hour before the addition of 2 M HOAc (600 mL) and toluene (600 mL). The organic layer was washed with saturated aq. NaHC03 and with brine. Concentration in vacuo and purification of the residue by flash chromatography (30% EtOAc in toluene) gave 63.48 g (91%) of the 2-(2-(3(S)-(3-(2-(7-chloro-2-quinolinyl)ethenyl)phenyl)-3-hydroxypropyl)phenyl)-2-propanol. 

It may be interesting, in connection with the ethylene/propylene copolymers mentioned above, to present here some homogeneous Ziegler-Natta catalysts formed by soluble complexes of titanium and magnesium chlorides with alkyl phosphates as catalyst precursors and alkylaluminium compounds as activators (TiCl4)x.(MgCl2)r [0=P(0Bu)3]3-A1(/-Bu)3 and Cl3TiOMgCl-[0 = P(0Bu)3]3- A1(z -Bu)3 (Al/Ti molar ratio of ca 10 1). These catalysts have been used for random ethylene/propylene copolymerisation [73],... 

Now consider a solution that has an analytical concentration of magnesium chloride of 0.100 M. Here, the molarities of positive and negative charge are given by... 

In the first equation, the molar concentration of magnesium ion is multiplied by two (2 X 0.100) because 1 mol of that ion contributes 2 mol of positive charge to the solution. In the second equation, the molar chloride ion concentration is twice that of the magnesium chloride concentration, or 2 X 0.100. To obtain the charge-balance equation, we equate the concentration of positive charge with the concentration of negative charge to obtain... 

The values of individual ionic conductivities can also be found by comparison between the extrapolated values. For example, the limiting molar conductivity of magnesium chloride is found to be 258.7 S cm moE. Comparison with the potassium chloride value yields the limiting ionic conductivity of magnesium ... 

A 0.5000 L volume of a solution contains 36.49 g of magnesium chloride, MgCl2. What is the molarity of the solution ... 

Concentration limits for chloride and acetate in PN typically are linked to limitations for sodium and potassium. The usual ratio of chloride acetate in PN is about 1 1 to 1.5 1. Chloride and acetate primarily play a role in acid-base balance. Acetate is converted to bicarbonate at a 1 1 molar ratio. This conversion appears to occur mostly outside the liver. Bicarbonate never should be added to or coinfused with PN solutions. This can lead to the release of carbon dioxide and potentially result in the formation of calcium or magnesium carbonate (very insoluble salts). 

Phenyl Phenylseleno Tellurium 0.79 g (5 mmol) of benzeneselenol are dissolved in 5ml of anhydrous tetrahydrofuran. Under nitrogen, 2.6 ml of 2 molar ethyl magnesium bromide (5.2 mmol) in diethyl ether are added, the mixture is heated under reflux for 2 h, cooled to 0°, and a solution of phenyl tellurium bromide, prepared from 1.02 g (2.5 mmol) of diphenyl ditellurium and 0.40 g (2.5 mmol) of bromine in tetrahydro-furan/benzene, is added. The reaction mixture is then warmed to 20°. stirred at 20" for 30 min, then 40 ml of low-boiling petroleum ether followed by aqueous ammonium chloride solution are added. The organic layer is separated, washed with saturated aqueous sodium chloride, dried with anhydrous magnesium sulfate, filtered, and evaporated. The residue (1.38g) is plaeed on a eolumn containing 120g of silica gel G, the product (Rf 0.60) is eluted with petroleum ether, the eluate is evaporated, and reddish needles are obtained yield 1.13 g (63%) m.p, 48° (petroleum ether). 

A,A-Dimethylaminothiocarbonyl Ethenyl Tellurium Under an argon atmosphere 6.38 g (50 mmol) of tellurium are added in one portion to 45.5 ml (23 mmol) of a 0.5 molar solution of vinylmagncsium bromide in tetrahydrofuran at — 78°. The mixture is stirred at — 78° for 1 h, warmed to 0°, and stirred at 0° for I h. The resultant yellowish-brown suspension is cooled to —78°, a solution of 6.18 g (50 mmol) of N,N-dimethylamino-(thiocarbonyl) chloride in 25 ml of tetrahydrofuran (freshly distilled from sodium) is added dropwise to the stirred suspension, and the mixture is stirred at — 78° for 0.5 h, at 0° for 1 h, and at 20" for 0.5 b. The mixture is then poured into ice/water and glacial acetic acid is added dropwise until the magnesium hydroxide has dissolved. The mixture is extracted three times with 150 ml portions of diethyl ether, the combined extracts arc washed three times with water, the ether solution is dried, and evaporated. The dcep-orange-red solid residue is the pure product yield 8.7 g (72%) m.p. < 25°... 

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