First slide

Diborane

Question

A convenient laboratory preparation of Diborane is

Moderate

A

$\large BF_3 + LiH \xrightarrow{{450K}}$
B

$BF_3 + LiAlH_4 \xrightarrow{{dry\;ether}}$
C

$NaBH_4 + I_2 \xrightarrow{{}}$
D

$BCl_3 + H_2 \xrightarrow[{450^\circ C}]{{Cu - Al}}\$

Solution

$\begin{gathered} 2B{F_3} + 6LiH\xrightarrow{{{{450}^0}}}{B_2}{H_6} + 6LiF \ \\ 4B{F_3} + 3LiAl{H_4}\xrightarrow{{{{Dryether}}}}2{B_2}{H_6} + 3LiF + 3Al{F_3} \\\ \end{gathered}$
$\begin{gathered} 2NaB{H_4} + {I_2}\xrightarrow{{DIGLYME}}{B_2}{H_6} + 2NaI + {H_2} \uparrow \\\ 2BC{l_3} + 6{H_2}\xrightarrow{{}}{B_2}{H_6} + 6HCl \\\ \end{gathered} \$
→ Diborane is prepared in laboratory by the oxidation of NaBH₄ with I₂ in diglyme as solvent.

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