Interaction of Carbene and Olefin Donors with [Cl₂PN]₃: Exploration of a Reductive Pathway toward (PN)₃

The iminophosphine–phosphazene [P^III–P^V] heterocyclic adduct [IPr·PN(PCl₂N)₂] was prepared via reduction of the cyclic phosphazene [Cl₂PN]₃ in the presence of the carbene donor IPr {IPr = [(HCNDipp)₂C:], where Dipp = 2,6-ⁱPr₂C₆H₃}. By contrast, the treatment of [Cl₂PN]₃ with the N-heterocyclic olefin IPrCH₂ yielded the olefin-grafted phosphazene ring [(IPrCH)P(Cl)N(PCl₂N)₂].