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How are reducing agents in synthetic org...

 How are reducing agents in synthetic organic chemistry prepared?

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Hydrogen has a tendency to react with reactive metals like lithium, sodium to give corresponding hydrides
`2Li+H_(2)to2LiH`
`2Na+H_(2)to2NaH`
These hydrides are used as reducing agents in synthetic organic chemistry. It is also used to prepare important hydrides such as lithium aluminium hydride and sodium boro hydride (organic reducing agents).
`4LiH+AICI_(3)toLi[LiH_(4)]+3LiCI`
`4 Nalt B(OCH_(3))_(3)toNa[BH_(4)]+3CH_(3)ONa`
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