[2] BEMP and P4-t-Bu|t-Bu-P4 have attracted attention because they are low-nucleophilic, which precludes their participating in competing reactions.
Protonation takes place at a doubly bonded nitrogen atom.
These are the highest pKa recorded for the conjugate acid of charge-neutral molecular base.
[4] In one implemention, t-Bu-P4 catalyzes the conversion of pivaldehyde to the alcohol:[5] Phosphazene bases have been used as basic titrants in non-aqueous acid–base titrations.
Bis(triphenylphosphine)iminium chloride [Ph3P=N=PPh3]+Cl−is also referred to as a phosphazene, where Ph = phenyl group.