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Bis- amido-zirconium

Scheme 5 Synthetic route toward the bis(amido) zirconium complex 11 [80] (11)... Scheme 5 Synthetic route toward the bis(amido) zirconium complex 11 [80] (11)...
The reaction of Cp"ZrF3 with an alumazene, [MeAlN(2,6-Pr 2C6H3)]3, leads to fluorine-nitrogen exchange and the formation of the bis(amido) zirconium fluoride 415300 (Equation (31)). This reaction proceeds with activation of Zr-F bonds, providing a unique route to aluminum-containing mixed zirconium amido fluorides. The molecular structure... [Pg.842]

Protonolysis of the f/ -styrene zirconium complex Cp Zr(t/ -PhCHCH2) [MeC(NPr )2] with 2 equivalents of Bu NH2 provided a high yield of a novel bis(amido) complex according to Scheme 93. ... [Pg.255]

The bis(amido) monocyclic zirconium metallocene (11) was obtained by the reaction of equimolar amounts of the zirconocene dichloride Cp2ZrCl2 and the dilithiated diamine (Me3SiN-(CH2)2-NSiMe3)Li2 in THF (Scheme 5). (The latter... [Pg.92]

Scheme 11.15 Hydroamination/cyclization of primary aminoalkenes using a neutral bis (phosphinic amido) zirconium catalyst system [88]. Scheme 11.15 Hydroamination/cyclization of primary aminoalkenes using a neutral bis (phosphinic amido) zirconium catalyst system [88].
Group 4 bis(amidate)bis(amido) complexes have also been identified as precatalysts for the more challenging hydroamination of alkenes. The majority of investigations in this field focus on the intramolecular cychzation of aminoalkenes with zirconium-based catalysts. [64e] Neutral group 4 bis(amidate) zirconium amido or imido complexes are efficient precatalysts for the intramolecular cychzation of primary amines to form pyrrolidine and piperidine products (Scheme 12). The monomeric imido complex can be generated by reaction of the bis(amido) complex with 2,6-dimethylaniline and trapped with triphenylphosphine oxide. [64e] The bis(amido) and imido complexes... [Pg.388]

Interestingly, by switching from bis(amidate) to bis(ureate) bis(amido) complexes, a broader scope of reactivity can be realized in intramolecular alkene hydroamination. [28] Reactivity studies indicate that the tethered zirconium bis(ureate) precatalysts are more reactive for intramolecular alkene hydroamination than the titanium analogs. [Pg.389]

Andersen RA (1979) Dialkylbis[bis(trimethylsilyl)amido]zirconium(IV) and -ha iium(IV). Preparation and reaction with carbon dioxide and tert-butylisocyanide. Inorg Chem 18 2928-2932... [Pg.137]

Fryzuk and co-workers prepared a bis-amido NHC ligand (Scheme 6.4). Addition of [Zr(NMe2)4] afforded zirconium complex [(NHC)Zr(NMe2)2] 34... [Pg.173]

Watson DA, Chiu M, Bergman RG. Zirconium bis(amido) catalysts for asymmetric intramolecular alkene hydroamination. Organometallics 2006 25(20) 4731 733. [Pg.1205]

A series of zirconium(IV) complexes that incorporate the macrocyclic bis (amido-phosphine) ligand 63 (R = Ph) were described. The starting material, complex 65 (R = Ph, M = ZrCl2) was prepared by reaction of syn-63 with ZrCl2(THF)2. The subsequent replacement of the chloride ligands has been... [Pg.391]

Fryzuk MD, Love JB, Rettig S (1998) Synthesis and structure of zirconium(lV) complexes stabilized by the bis(amido-phosphine) macrocycle [P2N2] [P2N2])PhP-(CH2SiMe2NSiMe2CH2)2PPh). Organometallics 17 846-853... [Pg.437]

Edworthy, I.S., Blake, A.J., Wilson, C. etal. (2007) Synthesis and NHClability of d° lithium, yttrium, titanium, and zirconium amido bis(N-heterocyclic carbene) complexes. Organometallics, 26, 3684. [Pg.349]


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