${\displaystyle {\begin{matrix}{}\\{\mathsf {{R{-}C{\equiv }C{-}H}\ +\ Br{-}C{\equiv }C{-}R'\quad {\xrightarrow[{\displaystyle NEt_{3}}]{\displaystyle \ CuBr\ }}\quad R{-}C{\equiv }C{-}C{\equiv }C{-}R'}}\end{matrix}}}$

In your article, replace the image with:

<math>\begin{matrix}{}\\
\mathsf{ {R{-}C{\equiv}C{-}H} \ + \ Br{-}C{\equiv}C{-}R' \quad \xrightarrow[\displaystyle NEt_3]{\displaystyle \ CuBr \ } \quad R{-}C{\equiv}C{-}C{\equiv}C{-}R'}
\end{matrix}</math>

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