Parahydrogen-induced polarization with a metal-free P-P biradicaloid

Metal-free H ₂ activations are unusual but interesting for catalytic transformations, particularly in parahydrogen-based nuclear spin hyperpolarization techniques. We demonstrate that metal-free singlet phosphorus biradicaloid, [P(μ-NTer)] ₂ , provides pronounced ¹ H and ³¹ P hyperpolarization while activating the parahydrogen molecules. A brief analysis of the resulting NMR signals and the important kinetic parameters are presented.