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Uranium cyclopentadienyls

Allyl Complexes. Allyl complexes of uranium are known and are usually stabilized by cyclopentadienyl ligands. AEyl complexes can be accessed via the interaction of a uranium halide and an allyl grignard reagent. This synthetic method was utilized to obtain a rare example of a "naked" homoleptic allyl complex, U(T -C2H )4 [12701 -96-17, which decomposes at 0°C. Other examples, which are more stable than the homoleptic allyl complex have been synthesized, ie, U(allyl)2(OR)2 (R = alkyl), U(allyl)2X (X = halide), and U(allyl)(bipy)2. [Pg.335]

Uranium(IV) chalcogenolate compounds have been synthesizing with several stoichiometries as the homoleptic [U(SR)4] (R = Et, Pr, Ph) obtained by reaction of [U(BH4)4] or [U(NEt2)4] with thiols or by oxidation of uranium with the disulfide,571 or those bearing cyclopentadienyl rings as [UCp3(ER)]... [Pg.56]

Substituent effects, 9 510 Substituted alkylhydrazines, 13 572-573 Substituted amide waxes, 26 221 Substituted cyclopentadienyl uranium complexes, 25 440-441 Substituted cyclopentadienyl (Cp)... [Pg.895]

Bis(i -benzene)molybdenum(0), 3514 Bis(cyeloetatetraene)uranium(0), 3708 Bis(cyclopentadienyl)bis(pentalluorophenyl)zirconium, 3830 Bis(cyclopentadienyldinitrosylchromium), 3275 Bis(cyclopentadienyl)hexalluoro-2-butynechromium, 3636 Bis(cyclopentadienyl)lead, 3294 Bis(cyclopentadienyl)magnesium, 3277 Bis(cyclopentadienyl)manganese, 3278 Bis(cyclopentadienyl)niobium tetrahydroborate, 3324... [Pg.303]

Tricyclopentadienyluranium tetrahydroalmninate, 3688 N. /V.4-Trilithioanilinc. 2180 Triphenylmethylpotassium, 3781 Tris(cyclopentadienyl)cerium, 3683 Tris(cyclopentadienyl)plutonium, 3 684 Tris(cyclopentadienyl)uranium, 3685... [Pg.304]

The question of the mode of bonding of the cyclopentadienyl rings in complexes of the type U(C5Hs)sX was settled by the structural determination of tris(ben-zylcyclopentadienide)uranium(IV) chloride (69). The structure as viewed down... [Pg.38]

A second example of a bis cyclopentadienyl uranium complex has resulted from the use of a bidentate, bridged bis(cyclopendadienyl) ligand to avoid further reaction to a tris species. It is prepared by the addition of the dianion of bis(cyclo-pentadienyl)methane to uranium tetrachloride in THE to give [CH2( — 5114)2]... [Pg.43]

However, in the sohd state only the n-bonded allyl species is observed. The molecular structure of tris( 5-cyclopentadienyl) (2-methylallyl)uranium(IV) (75)... [Pg.57]

The ground state geometries in these complexes are often determined by a subtle balance of the energy released by an increase in coordination number and the energy lost by intramolecular repulsion. The question of versus bonding in the tris(cyclopentadienyl)uranium aUyls is one molecular example. The structures of the lanthanide tiicyclopentadienides represent another example in extended crystalline arrays. [Pg.64]

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... [Pg.488]

Tris(bromomethyl)ethanol, 1916 Tris(cyclopentadienyl)cerium, 3676 Tris(cyclopentadienyl)plutonium, 3677 Tris(cyclopentadienyl)uranium, 3678 Tris(2,3-diaminobutane)nickel(II) nitrate, 3583 Tris(l,2-diaminoethane)chromium(III) perchlorate, 2615 Tris(l,2-diaminoethane)cobalt(III) nitrate, 2618 Tris(l,2-diammoethane)ruthenium(III) perchlorate, 2617 Tris(difluoroamino)fluoromethane, 0363 Tris(dimethylamino)antimony, 2594... [Pg.2153]

Bis(2,4-pentanedionato)chromium, 3320 Bis(benzene)chromium dichromate, 3845 Bis(benzeneiron)—fulvalenediyl complex, 3828 Bis(cycloctatetraene)uranium(0), 3701 Bis(cyclopentadienyl)bis(pentafluorophenyl)zirconium, 3824 Bis(cyclopentadienyldinitrosylchromium), 3269 Bis(cyclopentadienyl)hexafluoro-2-butynechromium, 3629 Bis(cyclopentadienyl)lead, 3288 Bis(cyclopentadienyl)magnesium, 3271 Bis(cyclopentadienyl)manganese, 3272 Bis(cyclopentadienyl)niobium tetrahydroborate, 3318... [Pg.2497]

Tris(2,4-pentanedionato)molybdenum(III), 3683 Tris(cyclopentadienyl)cerium, 3676 Tris(cyclopentadienyl)plutonium, 3677 Tris(cyclopentadienyl)uranium, 3678... [Pg.2498]

Figure 5.8 Tra-cyclopentadienyl uranium derivative chemistry. (From Ref. 263, with permission.)... Figure 5.8 Tra-cyclopentadienyl uranium derivative chemistry. (From Ref. 263, with permission.)...
See other pages where Uranium cyclopentadienyls is mentioned: [Pg.45]    [Pg.44]    [Pg.45]    [Pg.44]    [Pg.332]    [Pg.332]    [Pg.334]    [Pg.1278]    [Pg.224]    [Pg.1222]    [Pg.244]    [Pg.140]    [Pg.35]    [Pg.39]    [Pg.43]    [Pg.55]    [Pg.55]    [Pg.59]    [Pg.122]    [Pg.134]    [Pg.1143]    [Pg.2053]    [Pg.1269]    [Pg.1222]    [Pg.451]    [Pg.452]   
See also in sourсe #XX -- [ Pg.34 , Pg.108 , Pg.109 , Pg.110 , Pg.111 , Pg.112 , Pg.113 , Pg.114 , Pg.115 , Pg.116 , Pg.117 , Pg.118 , Pg.119 , Pg.120 , Pg.121 , Pg.122 , Pg.123 , Pg.124 ]

See also in sourсe #XX -- [ Pg.108 , Pg.109 , Pg.110 , Pg.111 , Pg.112 , Pg.113 , Pg.114 , Pg.115 , Pg.116 , Pg.117 , Pg.118 , Pg.119 , Pg.120 , Pg.121 , Pg.122 , Pg.123 , Pg.124 ]



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Cyclopentadienyl complexes of uranium, thorium and actinide metals

Uranium complexes cyclopentadienyls

Uranium cyclopentadienyl complexes

Uranium cyclopentadienyl complexes reactions

Uranium cyclopentadienyls adducts

Uranium cyclopentadienyls alkyl derivatives

Uranium cyclopentadienyls derivatives

Uranium cyclopentadienyls preparation

Uranium cyclopentadienyls reactions

Uranium cyclopentadienyls trimethylsilyl cyclopentadienyl

Uranium trimethylsilyl cyclopentadienyl

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