Facile Synthesis of Bifunctional Ligands using LiCH2PPh2═NPh Obtained from [PhNH−PPh3+][Br−]

A cyclic divalent N(I) species isoelectronic to carbodiphosphoranes

The formation of a rare type of diphosphazenium cation is described. Its synthesis features a unique oxidative dealkylation of an iminophosphorane-phosphole by a silver(I) salt. DFT study of this compound reveals the low valent character of the N(I) center.

Deactivation of the coordinating ability of the iminophosphorane group by the effect of ortho-carborane

An electron-withdrawing carborane group deactivates the nitrogen donor atom of an iminophosphorane ligand, which is not observed for organic ligands.

Synthesis of 2,3-dihydro-1H-phosphindole-1-oxides via the t-BuLi-mediated rearrangement of vinyl bromides and phosphine oxides

We report an intramolecular vinyllithium addition to phosphine oxides, and discovered an unexpected rearrangement to form unique cyclic phosphine oxides.

A tetracoordinated phosphasalen nickel(III) complex

The oxidation of a Ni(II) complex bearing a tetradentate phosphasalen ligand, which differs from salen by the presence of an iminophosphorane (PN) in place of an imine unit, was easily achieved by addition of a silver salt. The site of this oxidation was investigated with a combination of techniques (NMR, EPR, UV/Vis spectroscopy, X-ray diffraction, magnetic measurements) as well as DFT calculations. All data are in agreement with a high-valent Ni(III) center concentrating the spin density. This markedly differs from precedents in the salen series for which oxidation on the metal was only observed at low temperature or in the presence of additional ligands or anions. Therefore, thanks to the good electron-donating properties of the phosphasalen ligand, [Ni(Psalen)](+) represents a rare example of a tetracoordinated high-valent nickel complex in presence of a phenoxide ligand.

(Furfurylamino)triphenylphosphonium bromide

In the title salt, C₂₃H₂₁NOP⁺·Br⁻, the dihedral angles between the phenyl rings are 70.41 (18), 73.6 (2) and 80.85 (19)°. In the crystal, neighboring mol­ecules are linked through an N—H⋯Br hydrogen bond and four weak C—H⋯Br contacts, forming a three-dimensional network.