Synthesis and structure of an .eta.2-phosphaalkene nickel complex

Rearrangement of chloromethylphosphinidene into methylenechlorophosphine in the co-ordination sphere of tungsten. Stabilization of an unhindered PC double bond without deactivation by π-complexation

“…Where possible [compounds (4), (5), (7), and (9)], the products were isolated in the pure state by chromatography on silica gel with hexane. In all cases, they were mainly characterized by n.m.r.…”

Palladium Coordination Compounds of σ3λ5-Phosphoranes: First Examples of Phosphonio−Methylene(imino)metallophosphorane [(R3P)(Me3Si)CP(MLn)NSiMe3] and Phosphonio−Methylene(oxo)phosphorane [(R3P)(Me3Si)CP(O)NSiMe3] Ligands

“…In particular, the CP double bonds in several different types of ligands have been found to exhibit a preferential η 2 -coordination mode in many transition metal complexes. Several examples of η 2 -coordinated phosphaalkenes are known, − and there are examples of η 3 -coordinated diphosphaallyl complexes, − in which two bonds having CP double-bond character are coordinated; in addition, a few examples of η 2 -coordinated diphosphaallenes have been reported . There are also examples of cyclic phosphorus-substituted ligands including η 4 -phosphacyclobutadienes, η 5 -phosphacyclopentadienyls, and η 6 -phosphabenzenes in which delocalized rings containing CP double bonds are coordinated to transition metal complexes .…”

Ruthenaphosphaalkenyls: Synthesis, Structures, and Their Conversion to η2-Phosphaalkene Complexes

“…Thus, 32 which also exhibited a significantly lowfrequency resonance for P alkene (δ P 23). More recently, Ionkin described a similar situation (δ P 54) for his chelated phosphaalkene complex (Chart 3), 33 the significant shift from the free ligand (δ P 248), which was mirrored in the 13 C data (δ C 67, cf.…”