${\displaystyle {\begin{matrix}{}{\ce {R1-BY2{}+R2-X->[{\underset {\text{catalyst}}{\text{Pd}}}][{\text{Base}}]R1-R2}}\end{matrix}}}$

In your article, replace the image with:

<math chem>\begin{matrix}{} \ce{R1-BY2{} + R2-X ->[\underset{\text{catalyst} }{\text{Pd} }][\text{Base}] R1-R2} \end{matrix}</math>

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