Fig. 4.

Reaction generality for the dehydrocoupling of different phosphines with HA-2: reactions were performed with 0.1 mmol phosphines, 0.01 mmol tBuOK, 0.1 mmol HA-2, 0.5 mL THF 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 numbers in brackets were isolated yields. ^a25 °C within 5 min, ^b−20 °C within 5 min, ^c130 °C for 1 h