ChemicalBook CAS DataBase List Magnesium sulfate

Magnesium sulfate synthesis

3synthesis methods

Product Name:Magnesium sulfate
CAS Number:7487-88-9
Molecular formula:MgSO4
Molecular Weight:120.37

Hydrated magnesium sulfate occurs in nature as the minerals kieserite and epsomite. The salt is mined in large scale from these and other naturally occurring minerals. The salt also is prepared in the laboratory by the action of sulfuric acid on magnesium oxide, hydroxide, or carbonate followed by evaporation and crystallization:
MgO + H2SO4 → MgSO4 + H2O
Mg(OH)2 + H2SO4 → MgSO4 + 2H2O
MgCO3 + H2SO4 → MgSO4 + CO2 + H2O
Crystallization at temperatures between 1.8 and 48°C yields heptahydrate, MgSO4•7H2O. Below 1.8°C, a dodecahydrate , MgSO4•12H2O crystallizes out. Above 48°C crystals of lower hydrates form. The anhydrous salt is obtained by heating the heptahydrate at about 500°C in a rotary drum; or dehydrating above 150°C in the presence of sulfuric acid.

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Yield:-

Reaction Conditions:

with sodium carbonate in 1,4-dioxane;water;

Steps:

2.2 2.

2. Preparation of Phosphonic Acid Intermediates: Amine I (9.0 g, 41.1 mmol) was dissolved in 1,4-dioxane (100 mL). A solution of Na₂CO₃ (13.1 g, 123.3 mmol) in H₂O (50 mL) was added to the reaction mixture and stirred for 5 minutes at room temperature. After benzyl chloroformate (8.4 g, 49.3 mmol) was added, the reaction solution was stirred at room temperature overnight. The organic phase was diluted with EtOAc and extracted with H₂O and brine. The organic phase was dried over MgSO₄. Concentration of the filtrate from vacuum filtration removal of the MgSO₄ yielded an oil from which II was isolated by column chromatography (SiO₂, 20% EtOAc in hexane) as a clear oil (11.6 g, 80%). ¹H NMR (300 MHz, CDCl₃) δ 7.33 (s, 5H), 6.05 (dt, J=9.9, 17.1 Hz, 1H), 5.65 (d, J=23.7 Hz, 1H), 5. (d, J=17.1 Hz, 1H), 5.06 (m, 3H), 4.06 (m, 4H), 2.09 (m, 1H), 1.73 (m, 2H), 1.15 (dt, J=8.1, 26.4 Hz, 6H). ³¹P NMR (121.4 MHz, CDCl₃) δ 23.7

References:

US2011/306541,2011,A1

92298-55-0 Synthesis

tetraMethyl cyclohexane-1,2,4,5-tetracarboxylate

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144-55-8 Synthesis

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References

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7487-88-9
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References

Magnesium sulfate Related Search:

Magnesium stearate Magnesium oxide Calcium chloride Sodium 4-hydroxybenzenesulfonate Sodium acetate Aluminum chloride Sodium sulfate Potassium carbonate Magnesium chloride Platinum dioxide