Hydrocarbyl complexes

Hydroc rbylComplexes. Stable homoleptic and heteroleptic thorium hydrocarbyl complexes have been synthesized. Two common homoleptic species are [Li-TMEDA]2 Th(CH2). ] [92366-18-2] (19), where TMEDA = tetramethyl ethylenediarnine, and Th(CH2CgH ) [54008-63-8] (20). 

Hydrocarbyl Complexes. Stable homoleptic and heteroleptic uranium hydrocarbyl complexes have been synthesized. Unlike the thorium analogues, uranium alkyl complexes are generally thermally unstable due to P-hydride elimination or reductive elimination processes. A rare example of a homoleptic uranium complex is U(CH(Si(CH2)3)2)3, the first stable U(I11) homoleptic complex to have been isolated. A stmctural study indicated a triganol... 

III. Mechanisms for the C-H Activation Sequence Formation of a Pt(II) Hydrocarbyl Complex from Pt(II) and Hydrocarbon... 

Hydrocarbon sulfonates, 23 531 Hydrocarbon surfactants, 24 133 Hydrocarbon waxes, 26 220 Hydrocarbyl complexes of thorium, 24 773 of uranium, 25 441-442 Hydrochloric acid, 13 808-809, 821-822. See also Hydrogen chloride in ascorbic acid manufacture, 25 757 chlorine from, 6 172-175 constant boiling, 13 814t density and concentration of, 13 808t end use of chlorine, 6 135t for fermentation, 11 38... 

Uranium halide complexes, 25 437-439 physical constants for, 25 4371 Uranium hexachloride, 25 439 Uranium hexafluoride, 11 845, 859, 25 438 Uranium hydrocarbyl complexes,... 

The polymerization of ethylene was also qualitahvely inveshgated by pulse injec-hons of ethylene into helium flowing over thorium (67) and uranium (86) metallocene hydrocarbyl complexes supported on 7-AI2O3.950 at 25 °C, both revealing similar achvihes [171, 173]. Supported thorium half-sandwich complexes 65 exhibited higher achvity than surface species, resulhng from coordinatively more saturated tris(cyclopentadienyl) and metallocene U/Th-alkyl/hydride complexes, that is, 77, 79, 82, 90 and 91 [171]. C CP MAS NMR spectra revealed no clear evidence of ethylene insertion into [Th-CHs] or [AL5-CH3] moiehes of material... 

Despite this significant early work, the chemistry of r 2-hydrocarbyl complexes has not been appreciably further developed, and relatively few examples of "simple" r 2-hydrocarbyl ligands are recorded. Indeed, TpPtMe(ri -C2H4) (100)60 was the sole complex of C2H4 known before 2000, and only six more have been reported since. These were obtained by low-temperature protonation of the hydride complexes Tp Pt(R) H3 (R = Me, n = 2 151,65 n 1 152 66 R = Ph, n = 2 153,67 see also Section III.E) with... 

Bis-phenoxo hydrocarbyl complexes, with Ti(IV), 4, 331 Bisphenoxo ligands, on mono-Cp Ti(IV) complexes, 4, 485 Bis(phenoxy-aldehyde) dichlorides, with Zr(IV), 4, 787 Bis(phenoxy-amino) catalysts, in propylene polymerization,... 

Hydrocarbonyl compounds, lanthanide complexes, 4, 4 ( -Hydrocarbyl)bis(zirconocene), preparation, 4, 906 Hydrocarbyl-bridged cyclopentadienyl-amido complexes, with Zr(IV), 4, 864 Hydrocarbyl complexes bis-Cp Ti hydrocarbyls reactions, 4, 551 structure and properties, 4, 551 synthesis, 4, 542 cobalt with rf-ligands, 7, 51 cobalt with rf-ligands, 7, 56 cobalt with ]4-ligands, 7, 59 cobalt with rf-ligands, 7, 71 heteroleptic types, 4, 192 homoleptic types, 4, 192 into magnetic metal nanoparticles via ligand stabilization, 12, 87 via polymer stabilization, 12, 87 into noble metal nanoparticles... 

Imido dialkyl complexes, with tantalum, 5, 120 Imido-dicarbenes, with palladium, 8, 228-229 Imido groups, in Ru-Os mixed-metal clusters, 6, 1078 Imido hydrocarbyl complexes, with Re(VII), 5, 945 Imido ligands... 

Two factors are important for the success of this preparation Due to the high steric demand of the CH(SiMe3)2 ligand the intermediate hydrocarbyl complex can be isolated completely free of donor solvents and alkali halides. 

Scheme 62 Donor-induced aluminate cleavage of lanthanide(III) tetramethylaluminates as a general approach to unsolvated hydrocarbyl complexes [10,12,151]...

Cui, C., Shafir, A., Reeder, C.L. et al. (2003) Highly isospecific polymerization of methyl methacrylate with a bis(pyrrolylaldiminato)samarium hydrocarbyl complex. Organometallics, 22, 3357. 

Metallaboranes mirror the metal hydrocarbyl complexes of organometallic chemistry and offer the promise of a similar rich chemistry.1 Indeed there are a number of strictly isoelectronic borane and hydrocarbon complexes in which a C atom is formally replaced with a B or BH moiety.2 Comparison of the structure and properties of these compound pairs highlights interesting similarities and differences between the organic and inorganic derivatives.3... 

Carbon monoxide insertion reactions in hydrocarbyl complexes of group VIII are particularly relevant because several industrial processes involving carbonylation of an organic substrate are catalyzed by metals belonging to this group. In the subsections that follow, reference to catalytic processes is made on each specific occasion. 

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