Fig. 6.

Catalytic homodehydrocoupling of phosphines using hydrazobenzene as HA. a ³¹P{¹H} NMR spectra in THF with different amounts of added tBuOK for the dehydrocoupling of 1a in the presence of hydrazobenzene. b Catalytic results with different substituted phosphines: reactions were performed with 0.1 mmol phosphines, 0.1 mmol tBuOK and 0.1 mmol hydrazobenzene, 0.5 mL THF at 25 °C in a J. Young NMR tube and yields were based on the phosphine as the limiting reagent and determined by ³¹P{¹H} NMR spectroscopy using a capillary of PCl₃ as a calibration standard, the number in brackets shows an isolated yield