First slide

Diborane

Question

In the reaction :
2X + B₂H₆ → [BH₂(X₂)]⁺[BH₄]^– 'X'
'X' cannot be

Moderate

A

NH₃
B

CH₃NH₂
C

(CH₃)₂NH
D

(CH₃)₃N

Solution

${B_2}{H_6} + \mathop {N{H_3}}\limits_{Excess} \xrightarrow{{Low\,temperature}}\mathop {\mathop {\,{{[{H_3}N \to B{H_2} \leftarrow N{H_3}]}^ + }B{H_4}^ - }\limits_{OR} }\limits_{{B_2}{H_6}.2N{H_3}}$
$\mathop {\mathop {\,{{[{H_3}N \to B{H_2} \leftarrow N{H_3}]}^ + }B{H_4}^ - }\limits_{OR} }\limits_{{B_2}{H_6}.2N{H_3}} \xrightarrow{\Delta }\mathop {{B_3}{N_3}{H_6}}\limits_{Borazole}$
The "X'' cannot be a tertiary amine.

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