Question

Predict the major product, when 2-methyl-but-2-ene is converted into alcohol in the following method.

Hydroboration

Answer 1

\[\begin{array}{cc}
\phantom{...............................................}\ce{CH3}\\
\phantom{............................................}|\\
\ce{6CH3 - C = CH - CH3 + B2H6 -> 2[(CH3)2 CH - CH -]_3 B}\\
|\phantom{..........................................}\\
\ce{\underset{(2-methyl-but-2-ene)}{CH3}}\phantom{.......................................}
\end{array}\]

\[\begin{array}{cc}
\phantom{..}\ce{CH3}\phantom{............................}\ce{CH3}\phantom{...}\ce{CH3}\phantom{...}\\
\phantom{.}|\phantom{................................}|\phantom{......}|\phantom{....}\\
\ce{[(CH3)2 CH - CH -]_3 B + 3H2O2 ->[OH^Θ] \underset{(3-methyl-butan-2-ol)}{3CH3 - CH - CH - OH} + H3BO3}
\end{array}\]