Potassium trifluoro(3-phenyl-1H-pyrazol-5-yl)borate synthesis

Yield:-

Steps:

Multi-step reaction with 3 steps
1.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C / Inert atmosphere
1.2: 1 h / -78 - -20 °C / Inert atmosphere
1.3: 1 h / -20 - 20 °C / Inert atmosphere
2.1: manganese(IV) oxide / acetone / 2 h / 20 °C / Inert atmosphere
3.1: hydrazine hydrate / ethanol / 2 h / 20 °C / Inert atmosphere

References:

Kirkham, James D.;Edeson, Steven J.;Harrity, Joseph P. A.;Stokes, Stephen [Organic Letters,2012,vol. 14,# 20,p. 5354 - 5357,4]