Feibelman, Peter J. published the artcileWhat Limits Turnover Number in NH3 Synthesis on a PNP Pincer Molecule?, SDS of cas: 338800-13-8, the publication is Comments on Inorganic Chemistry (2014), 34(1-2), 3-16, database is CAplus.
Abiol. NH3 synthesis under mild conditions on a PNP [=2,6-bis(di-tert-butyl-phosphinomethyl)pyridine] pincer chelating an Mo(N2)3 group has been reported and attributed to a catalytic cycle wherein only the equatorial N2 is reduced. The present calculations suggest that reduction of axial N2 ligands was the reason the cycle ended after production of 23 equivalent of NH3. NH3 detachment from axial NNH3 initiates a terminal reaction pathway by leaving an axial nitrido N behind on the Mo. The trans influence of the strong axial nitride bond causes the second axial N2 to detach from the Mo, with N-Mo-N2 remaining as a non-catalytic, pincer-chelated group.
Comments on Inorganic Chemistry published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, SDS of cas: 338800-13-8.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem