Q.1 How will you prepare LAH. Explain any two properties of it.
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Answer:
Lithium aluminum hydride (LiAlH4; LAH): A hydride source used primarily for reduction of carbonyl compounds. Molecular structure of lithium aluminum hydride. Lithium aluminum hydride reduces a ketone to a secondary alcohol.
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Explanation:
LiAlH4 is then prepared by a salt metathesis reaction according to:
NaAlH4 + LiCl → LiAlH4 + NaCl
Properties:
- reaction:LAH violently reacts with water, including atmospheric moisture to liberate dihydrogen gas. The reaction proceeds according to the following idealized equation:
- LiAlH4 + 4 H2O → LiOH + Al(OH)3 + 4 H2
- reducing agent:LiAlH4 is a powerful reducing agent compared to sodium borohydride, NaBH4, since the Al-H bond is weaker and thus less stable than B-H bond.
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