Chelate amido complexes

The proposed reaction mechanism involves intermolecular nucleophilic addition of the amido ligand to the olefin to produce a zwitterionic intermediate, followed by proton transfer to form a new copper amido complex. Reaction with additional amine (presnmably via coordination to Cn) yields the hydroamination prodnct and regenerates the original copper catalyst (Scheme 2.15). In addition to the NHC complexes 94 and 95, copper amido complexes with the chelating diphosphine l,2-bis-(di-tert-bntylphosphino)-ethane also catalyse the reaction [81, 82]. 

Lewis Base Complexes, Chelated Metal Amides and Heteroleptic Amido Complexes... 

Aluminium complexes of chelating amido ligands are perhaps the most common type of monomeric four-coordinate aluminium amide. A full listing of such complexes will not be provided and selected examples will suffice to illustrate synthetic approaches and... 

Monomeric thallium(I) amides and related species have also be obtained by using chelating amido or related ligands, as in the p-diketiminato complexes [Tl( NDippC-(R) 2CH)] (R = CH3 or (T ) " and TIL (L = N(SiMe3)C(Ph) 2CH or N(Dipp)C-... 

Chatancin, via ring-closing metathesis, 11, 252 Chelate coordination, monoenes, in Pd(II) complexes, 8, 331 Chelated alkenes, with iron, 6, 133 Chelated allyl complexes, with iron, 6, 140 Chelating aryloxides, with Zr(IV), 4, 784 Chelating bis(amido) complexes, with Zr(IV), 4, 767 Chelating bis(amido) phosphine-donor complexes, with Zr(IV), 4, 816... 

For the case of chelating phosphines, Hartwig noted that palladium aUcoxide complexes can be formed by treatment of the corresponding halides with base, and that amido complexes can, in turn, be formed from the aUcoxide. This observation opened the possibility that aUcoxide intermediates lie on the catalytic cycle (lower pathway in Scheme 7). Van... 

Functionalized tertiary aryl phosphines play an important role in transition metal coordination chemistry. These compounds have been used as ligands in synthesis, catalysis, mechanistic studies, and in the study of coordination compounds as structural models. In this contribution the syntheses of two new types of these ligands, tertiary aryl phosphines functionalized by an amide group, are detailed. The published coordination chemistry of these compounds includes the study of intramolecular N—H oxidative addition, the synthesis of chelates stabilized amido complexes, and the preparation of complexes with both ftve- and six-membered chelate rings. ... 

Type 4 and 5 alkyl complexes also catalyze the regioselective hydrogenation of acyclic imines (190 psi of H2, 90 °C, TOF = 0.40 h ) [147]. The stoichiometric reaction of A -benzylidene(trimethylsilyl)imine with 4(Sm CH(SiMc3)2) yielded a desilylated Cp 2Sm-imine-amido complex with a four-membered Sm(NSi-Me3)(CPh)N=CHPh chelate ring which converts further to Se-symmetric... 

The stoichiometric reaction of 2-methylen-l-pyrroline results in the formation of a Cp2 Sm-imine-amido complex in which two substrate molecules have been coupled to form a six-membered chelate ring (Scheme 148).620... 

The stoichiometric reaction of iV-benzylidene(trimethylsilyl)amine with [Cp 2Sm(/r-H)]2 yields a Cp2 Sm-imine-amido complex with a four-membered Sm(NSiMe3)(CPh)N=CHPh chelate ring. Heating of this product under H2 gave -symmetric [Cp2 SmCN]6, which contains an unusual chair-like 18-membered (SmCN)6 ring.620... 

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