67506-89-2Relevant academic research and scientific papers
(C5Me5)2UCl*tetrahydrofuran. Oxidative-addition and Related Reactions
Finke, Richard G.,Hirose, Yoshiki,Gaughan, Glen
, p. 232 - 234 (1981)
The first examples of organoactinide oxidative-addition of alkyl halides are reported, reactions which proceed at unprecedented rates; the results presented include the stoicheiometries of these reactions, the new complexes (C5Me5)2UX2, (C5Me5)2UX(Y), and (C5Me5)2UY(R) (X, Y = Br, I), the series of halide exchange equilibria by which these new complexes are formed, determination of the appropriate equilibrium constants to +/- 10 percent, independent syntheses for these new complexes, and evidence for a previously unknown type of UIII to UIV redox-halide exchange equilibrium and its equilibrium constant.
Incorporation of Boron into Uranium Metallacycles: Synthesis, Structure, and Reactivity of Boron-Containing Uranacycles Derived from Bis(alkynyl)boranes
Ma, Wangyang,Douair, Iskander,Maron, Laurent,Ye, Qing
supporting information, p. 13573 - 13577 (2020/09/23)
The reaction of uranacyclopropene complex (C5Me5)2U[η2-1,2-C2(SiMe3)2] with B-aryl bis(alkynyl)borane PhB(C≡CPh)2 led to the first six-membered uranium metallaboracycl
COMPLEXES BISCYCLOPENTADIENYLES DISSYMETRIQUES ET TRISCYCLOPENTADIENYLES MIXTES DE L'URANIUM(IV). U COMME CENTRE DE PSEUDOASYMETRIE
Dormond, A.
, p. 47 - 56 (2007/10/02)
Starting from the monocyclopentadienyls U(C5Me4R)X3 (X = Cl or NEt2, R = CH3 or C2H5), the bis-cyclopentadienyl dissymetric complexes U(C5Me4R)CpX2 (Cp = substituted or unsubstituted cyclopentadienyl ligand) and the tris-cyclopentadienyl complexes U(C5Me4R)Cp2Cl are obtained.If the two Cp ligands have a chiral center, a mixture of one racemic and two meso isomers is obtained.In the meso isomers, the uranium atom is a pseudoasymmetric center.
Synthesis and properfies of a new class of highly reactive trivalent actiniae organometaiiic compounds. Derivatives of bis(pentamethylcyciopentadienyl)uranium(III)
Pagan, Paul J.,Manrsquez, Juan M.,Marks, Tobin J.,Day, Cynthia S.,Vollmer, Sara H.,Day, Victor W.
, p. 170 - 180 (2008/10/08)
Hydrogenolysis of the uranium(IV) alkyl complexes U[η5-(CH3)5C5]2(R)Cl results in clean reduction to the uranium(III) complex {U[η5-(CH3)5C5] 2(μ-Cl))3, which has been structurally characterized by single-crystal X-ray diffraction. This molecule crystallizes in the monoclinic space group C2/c - C2h6 (No. 15) with four molecules in a unit cell of dimensions a = 21.886 (7) A?, b = 14.236 (5) A?, c = 24.517 (7) A?, and β = 128.65 (2)°. Least-squares refinement led to a value for the conventional R index (on F) of 0.042 for 6813 independent reflections having 2θMoKα 3σ (I). The molecular structure consists of approximately D3h trimers with pseudotetrahedral U[η5-(CH3)5C5]2 units connected by bridging chloride ligands. The average U-C distance is 2.768 (11) A?, and the average U-Cl, 2.900 (2) A?. The average Cl-U-Cl angle is 83.8 (1)°. The trimer reacts with Lewis bases to form adducts U[η5-(CH3)5C5] 2Cl·L, where L = THF, pyridine, P(CH3)3, and (C2H5)2O. Stable, monomeric uranium(III) alkyl and amide complexes, U[η5-(CH3)5C5] 2CH[Si(CH3)3]2 and U[η5-(CH3)5C5] 2N[Si(CH3)3]2 can be prepared by the reaction of the chloride trimer with LiCH[Si(CH3)3]2 and NaN[Si(CH3)3]2, respectively. Reaction of unsaturated organic molecules with {U[η5-(CH3)5C5] 2(μ-Cl)}3 results in an interesting disproportionation reaction in which the trimer formally donates 1.5 equiv each of U[η5-(CH3)5C5]2 and U[η5-(CH3)5C5] 2Cl2. In particular, the reaction of diphenylacetylene, tetraphenylcyclopentadienone, and 9,10-phenanthrenequinone produces, respectively, [μ5-(CH3)5C5] 2UC(C6H5) = C(C6H5)C(C6H5) = C(C6H5), U[η5-(CH3)5C5] 2[η2-COC4(C6H5) 4], and {U[η5(CH3)5C5] 2[9,10-phenanthrenequinonate]}x with an equivalent amount of U[η5-(CH3)5C5] 2Cl2 formed in each case. The reduction of U[η5-(CH3)5C5] 2Cl2 has been accomplished with sodium amalgam and, after workup, yields the complex U[η5-(CH3)5C5] 2Cl2Na·(THF)x. Sodium amalgam reduction of U[η5-(CH3)5C5] 2Cl2 in the presence of diphenylacetylene produces the uranotetraphenylcyclopentadiene complex in good yield. Overall, the organometallic chemistry of U(III) has distinct similarities to that of Ti(III), as well as to that of lanthanides in the +3 oxidation state.
