Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmettalen

High-valent Organorhenium Compounds

“…This description does not take into account the ability of the oxo groups to contribute up to six electrons each to the metal, but the compounds do form Lewis-base adducts (Scheme 6 and Table i) 19 ' 51 ' 53 * 55 -7 The quinuclidine adduct (13) has a characteristic structure, but, for example, the aniline adduct o f (12) crystallizes with two isomers in the unit cell, one similar to (13) and the other with the aniline trans to an oxo group. Octahedral [ReO 3 MeL 2 ] compounds are also known ( Table 1).…”

“…78 Hydrolysis without the acid or alumina treatment, or conproportionation between the diimido and dioxo complexes both give the oxo-imido complex [Re(Ndip)-I n the structure of (19) the alkylidene ligand orientation is such that the p-n donor orbital o f the ligand (counting C R 2 2~) is in the plane bisecting the O-Re-0 angle. 70 Proton NMR studies suggest that all of the related diimido alkylidenes have structures analogous to (19). The quinuclidene adduct of (19) has also been structurally characterized.…”

“…75 Relatively f e w rhenium(VII) oxo alkylidenes have been prepared. Compound (19) is formed on photolysis of [ReO 2 (CH 2 Bu l ) 3 ] in pyridine 70 and by acid-or alumina-catalyzed hydrolysis of [Re(Ndip) 2 {C(H)Bu t }(CH 2 Bu t )]. 78 Hydrolysis without the acid or alumina treatment, or conproportionation between the diimido and dioxo complexes both give the oxo-imido complex [Re(Ndip)-I n the structure of (19) the alkylidene ligand orientation is such that the p-n donor orbital o f the ligand (counting C R 2 2~) is in the plane bisecting the O-Re-0 angle.…”

The “Peroxo Perrhenic Acid” H4Re2O13: An Oxygen‐Rich Metal Peroxide and Oxidation Catalyst

“…conditions: Catalyst (0.1 mmol) ([CH,ReO,] [l], [CH,ReO,].bipy [20], Re,O,,bipy [19], ReO,, [CH,ReO,].tpy [21]…”

Solidos ácidos de Lewis como catalizadores heterogéneos en reacciones de oxidación de interés en química fina.

“…Las resinas de intercambio iónico como la Amberlite [119] también se han ensayado como soportes de HPA´s con P y W en reacciones de oxidación de distintas olefinas y terpenos con moderada actividad; además de carbón activo y alúmina [120]. En el caso de las reacciones de oxidación en fase gaseosa con oxígeno molecular, HPA´s con P y Si como heteroátomos catalizan reacciones de oxidación de alquenos, grupos carbonílicos, ésteres, nitrilos y amidas, entre otros [121][122][123].…”