Lease, Nicholas’s team published research in Organometallics in 37 | CAS: 338800-13-8

Organometallics 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.

Lease, Nicholas published the artcilePNP-Pincer Complexes of Osmium: Comparison with Isoelectronic (PCP)Ir and (PNP)Ir+ Units, SDS of cas: 338800-13-8, the publication is Organometallics (2018), 37(3), 314-326, database is CAplus.

Several complexes of (tBu4PNP)Os (1, tBu4PNP = C5NH3-2,6-(CH2PtBu2)2) are reported. 1 Is isoelectronic with (tBu4PCP)Ir (2, (tBu4PCP)Ir = κ3-C6H3-2,6-(CH2PtBu2)2) which has played a leading role in homogeneous catalytic alkane dehydrogenation; the (tBu4PNP)Os complexes were studied in this context. (tBu4PNP)OsH4 (1-H4) is analogous to (tBu4PCP)IrH4 (2-H4), but while 2-H4 has some character of a dihydrogen dihydride, 1-H4 is unambiguously a tetrahydride. Ethylene reacts with 1-H4 to afford trans-(tBu4PNP)OsH2(C2H4) (1-H2(C2H4)). At 25°, 1-H2(C2H4) readily undergoes reversible ethylene insertion into an Os-H bond to yield (tBu4PNP)OsH(C2H5) (1-EtH). DFT calculations indicate that alkane C-H addition to 1 is thermodynamically much more favorable than addition to 2. The favorable thermodn. of 1-(alkyl)H, however, disfavor reductive elimination and formation of the free Os(0) fragment that is required for a catalytic cycle analogous to that reported for 2. C-H or H-H addition to 1 is much more favorable than to 2; this would typically be attributed to the lower oxidation state of 1. However, H2 addition to the isoelectronic [(tBu4PNP)Ir(I)]+ cation is even more favorable than addition to 1; thus the thermodn. differences result from the difference of the pincer ligand (PNP vs. PCP) rather than the different metal centers (Os(0) vs. Ir(I)). Although H2 addition to Ir(I) is as favorable as addition to Os(0), addition of a 2nd mol. of H2 (to give tetrahydrides) is much more favorable for (tBu4PNP)Os. NBO anal. indicates that the MH2/MH4 additions are oxidative whereas the M/MH2 transformations are reductive.

Organometallics 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