$\begin{matrix}
   O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\, \\
   ||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   N\equiv C-C{{H}_{2}}-C-C{{H}_{2}}-CH=C{{H}_{2}}\to   \\
\end{matrix}$ $\begin{matrix}
   OH\,\,\,\,\,\,\,\,\,  \\
   |\,\,\,\,\,\,\,\,\, \,\,\,\, \\
   N\equiv C-C{{H}_{2}}-\underset{H}{\mathop{C}}\,-C{{H}_{2}}-CH=C{{H}_{2}}  \\
\end{matrix}$