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Metal-arene complexes catalysts

James et al. reported a case of product inhibition in the Rh-catalyzed enantioselective hydrogenation of N-phenyl benzaldehyde imine [37]. These authors were able to isolate the deactivated catalyst, and to obtain its X-ray structure, which showed, surprisingly, that it was a rhodium complex with the product bound through a rf-n-axene interaction (Scheme 44.5). More cases of inhibition via formation of metal arene complexes will be detailed in Section 44.5. [Pg.1497]

The Fischer-Hafner synthesis of sandwich compounds (33) does not permit functional groups to be incorporated into the arenes because of side reactions with the Lewis acid catalyst (Friedel-Crafts reducing conditions). This is not the case when metal atoms are used directly. Many metal-arene complexes have been identified that contain F, Cl, CH30, R2N and C02R substituents. It is reasonable to assume that polymer-bound phenyl substituents containing these functional groups will yield similar sandwich complexes. [Pg.248]

An interesting aspect is the application of these arene functionalised imidazolium salts as organometallic ionic liquids [139,142,143] whereby the imidazolium salt functions as the ionic liquid itself [139,143] or as the ionic liquid compatible part of the compound using the transition metal arene complex as a catalyst in biphasic applications [142],... [Pg.249]

The reactions involving the metals are usually carried out in liquid ammonia or an ether such as THF as solvent (equations 19-611 and 19-712), and can be accelerated by sonication. They involve electron transfer processes, and can also be accomplished with a metal-arene complex M Arll-, or with the metal and a trace of an arene as catalyst. The composition of the product can be determined by adding an excess of bromobenzene and analysing for PhBr and R3SnPh by GLC.12... [Pg.312]

We firmly hope that this book will provide an additional stimulus to the vigorous development of the chemistry of metal arene complexes, an area of research that we and our students and coworkers have all found so stimulating an area that again and again provides new reactions, selective methods, ligands and catalysts for future chemistry. [Pg.2]

Catalysis with transition-metal arene complexes has provided a new manifold of synthetic options. The broad features of accessible reaction pathways are well established, and organic chemists can feel comfortably about incorporating such methodology into their armory. We are sure that many new synthetically useful reactions using arene metal catalysts will be developed in the nearest future. [Pg.202]

Rigby J, Kondratenkov M (2004) Arene Complexes as Catalysts. 7 181-204 Risse T, Freund H-J (2005) Spectroscopic Characterization of Organometallic Centers on Insulator Single Crystal Surfaces From Metal Carbonyls to Ziegler-Natta Catalysts. 16 117-149... [Pg.286]

Arene hydrogenation catalysts based on other metals than late transition ones are less numerous. Of particular relevance are the results reported by Rothwell, who found that Nbv and Tav hydride complexes containing bulky aryloxide ligands (Fig. 16.2) are active for the homogeneous hydrogenation of arenes [30]. [Pg.464]

Titanium(II) arene complexes, (r -arene)Ti(AICl4)2, are readily obtained from the reaction between TiC, aluminium powder and aluminium chloride in refluxing aromatic solvent [182]. Metal halides have been used as Lewis acid catalysts for various... [Pg.85]

Other interesting systems have been employed, such as CO/HjO (water gas) or CO/Hj (syngas) as reducing mixtures [49, 50], phase transfer catalysis [37], and more recently, aqueous [46, 47] and non-aqueous ionic liquid [48] biphasic catalysis which offer more promise for practical uses. Some interesting examples of metal complexes grafted onto oxides [55, 56] or supported metals [38, 39] as arene hydrogenation catalysts have been provided. [Pg.64]


See other pages where Metal-arene complexes catalysts is mentioned: [Pg.182]    [Pg.26]    [Pg.940]    [Pg.267]    [Pg.233]    [Pg.21]    [Pg.58]    [Pg.241]    [Pg.52]    [Pg.46]    [Pg.397]    [Pg.238]    [Pg.34]    [Pg.498]    [Pg.194]    [Pg.267]    [Pg.183]    [Pg.242]    [Pg.18]    [Pg.1153]    [Pg.565]    [Pg.805]    [Pg.529]    [Pg.54]    [Pg.1743]    [Pg.118]    [Pg.72]    [Pg.72]   
See also in sourсe #XX -- [ Pg.107 , Pg.108 , Pg.109 , Pg.110 , Pg.111 , Pg.112 , Pg.113 , Pg.114 ]




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Arene catalysts

Arene complexe

Arene complexes

Arenes catalysts

Arenes complexes

Arenes metal complexes

Arenes metalation

Arenes metalations

Arenes metallation

Metal arene

Metal arenes

Metal-arene complexes

Metalated arenes

Metalation arene

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