Phosphonium


BOP or Castro’s reagent (Benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate)


PyBOP ((Benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate)


PyAOP (7-Azabenzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate)


PyBroP (Bromotripyrrolidinophosphonium hexafluorophosphate)