$\mathrm{B}{\left(\mathrm{OH}\right)}_3+ \mathrm{NaOH} \to {\mathrm{NaBO}}_2 + \mathrm{Na}\left[\mathrm{B}{\left(\mathrm{OH}\right)}_4\right] + {\mathrm{H}}_2\mathrm{O}$

How can this reaction is made to proceed in forward direction?

${\mathrm{H}}_3{\mathrm{BO}}_3$ acts as weak monobasic Lewis acid

$\left(\mathrm{i}\right) \mathrm{B} {\left(\mathrm{OH}\right)}_3 + \mathrm{NaOH} \to \mathrm{Na}\left[\mathrm{B}{\left(\mathrm{OH}\right)}_4\right]$

On addition of cis - 1,2 - diol in H₃BO₃ solution, acidic strength of H₃BO₃ increase due to chelation effect