$\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,} \\ 
  {C{H_3} - C} 
\end{array}$ $ —\leftarrow$ $CH_2$ $ \rightarrow—$ $\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C - C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$ માં બે ઇલેકટ્રોન વીથડ્રોઈંગ સમૂહો ની આસપાસ છે જે તેને સક્રિય મિથીલીન સમૂહ બનાવે છે.