Synthesis and ROMP activity of aminophenol-substituted tungsten(VI) and molybdenum(VI) complexes

Heptacoordinated Molybdenum(VI) Complexes of Phenylenediamine Bis(phenolate): A Stable Molybdenum Amidophenoxide Radical

“…5,6,7 In the current contribution, we although similar reactivity with MoO2Cl2 derivatives has been observed earlier. 8,9 In general, the cleavage of both metal-oxo bonds and the formation of a Mo(VI) compound without any multiply bonded terminal ligands is rare. 10 As structurally comparable 2,2′-biphenyl-bridged…”

Synthesis and structural characterization of Pd(II) complexes containing 2,6-bis[(dimethylamino)methyl]-4-methylphenolate ligand

“…The steric and electronic nature of this aminophenolate ligand can readily be changed to fine tune the property of its complex, which is often used as a catalyst for reactions such as ring-opening metathesis polymerization of 2-norbornene [2], lactide polymerization [3] and the hydrolysis of b-lactam substrates [4]. van Koten and co-workers reported vanadium complexes of 1 which are catalysts for the polymerization of a-olefins [5].…”

“…This complex is formed by substituting both the acetate anions of [Pd(OAc) 2 ] with the anions of the ligand, resulting in the concomitant formation of acetic acid. The complex 3 was also obtained in 33% crystalline yield when two equivalents of the lithium salt of the ligand, which was generated in situ by the addition of n BuLi to a solution of 1 in diethylether, is treated with one equivalent of [Pd(COD)Cl 2 ] (Scheme 2).…”

Imidotungsten(VI) complexes with chelating phenols as ROMP catalysts

“…The hydrolytic stability of high-valent tungsten complexes can be improved by coordinative protection, i.e. by using chelating ligands, which carry a potentially coordinating neutral group within the molecule [7,8]. Such hemilabile ligands are important in catalysis because they stabilize inactive states while freeing up coordination sites when they are needed, thus adopting the role of a coordinating solvent [9].…”

“…1) using a simple two-step reaction [8,10]. The first step comprises a reaction of WOCl 4 with a stoichiometric amount of phenolic ligand precursor in CH 2 Cl 2 , whereas the second step involves a reaction of formed tungsten oxo compound with phenyl isocyanate in toluene, which reaction produces a final imido complex.…”