Synthesis and Comparative η<sup>1</sup>-Alkyl and Sterically Induced Reduction Reactivity of (C<sub>5</sub>Me<sub>5</sub>)<sub>3</sub>Ln Complexes of La, Ce, Pr, Nd, and Sm
作者:William J. Evans、Jeremy M. Perotti、Stosh A. Kozimor、Timothy M. Champagne、Benjamin L. Davis、Gregory W. Nyce、Cy H. Fujimoto、Robert D. Clark、Matthew A. Johnston、Joseph W. Ziller
DOI:10.1021/om050402l
日期:2005.8.1
previously described Ce or Pr complexes containing the (C5Me5)- ligand. The η1-C5Me5 alkyl-like reactivity of the (C5Me5)3Ln complexes was investigated with CO, ethylene, THF, and H2. The sterically induced reduction (SIR) reactivity of the (C5Me5)3Ln complexes was examined with SePPh3, AgBPh4, C8H8, and phenazine. All of these data indicate that (C5Me5)3Ln reactivity increases with decreasing size
的合成(C 5我5)3 Ce和(C 5我5)3镨从[(C 5我5)2 LN] [(μ-PH)2 BPH 2 ]和KC 5我5完成该系列的较大的镧系元素La-Nd和Sm在空间上拥挤(C 5 Me 5)3 Ln络合物,并且可以比较结构和反应性随金属尺寸的变化。这些新的(C 5 Me 5)3的合成Ln配合物需要甲硅烷基化的玻璃器皿,这在空间上更拥挤的类似物上是不必要的。(C 5 Me 5)3 Ce和(C 5 Me 5)3 Pr显示比任何先前描述的包含(C 5 Me 5)-配体的Ce或Pr配合物更长的Ln-C(C 5 Me 5)距离。在η 1 -C 5我5烷基,如(C反应性5我5)3成LN络合物用CO,乙烯,THF,和H调查2。用Se PPh 3,AgBPh 4,C 8 H 8和吩嗪检查(C 5 Me 5)3 Ln复合物的空间诱导还原(SIR)反应性。所有这些数据表明,(C 5 Me 5)3 Ln
Reactivity Study of Pyridyl-Substituted 1-Metalla-2,5-diaza-cyclopenta-2,4-dienes of Group 4 Metallocenes
molecules is investigated. The addition of H2, CO2, Ph−C≡N, 2‐py−C≡N, 1,3‐dicyanobenzene or 2,6‐dicyanopyridine results in exchange reactions, which are accompanied by the elimination of a nitrile. For CO2, a coordination to the five‐membered cycle occurs in case of Cp*2Zr(N=C(2‐py)−C(2‐py)=N). A 1,4‐diaza‐buta‐1,3‐diene complex is formed by H‐transfer in the conversion of the analogous titanocene
Reductive silylation of Cp*UO<sub>2</sub>(<sup>Mes</sup>PDI<sup>Me</sup>) promoted by Lewis bases
作者:J. J. Kiernicki、J. S. Harwood、P. E. Fanwick、S. C. Bart
DOI:10.1039/c5dt04776e
日期:——
reported. Silylating reagents, R3Si-X (R = Me, X = Cl, I, OTf, SPh; R = Ph, X = Cl), effectively add across the strong OUO bonds in the presence of the Lewis base, OPPh3, generating products of the form (R3SiO)2UX2(OPPh3)2 (R = Me, X = I (2-OPPh3), Cl (3-OPPh3), SPh (5-OPPh3), OTf (6-OPPh3); R = Ph, X = Cl (4-OPPh3)). During this transformation, reduction to uranium(IV) occurs with loss of (Cp*)2 and
Cp * UO 2(Mes PDI Me)(1-PDI)中的铀酰部分(UO 2 2+)的功能化(Mes PDI Me = 2,6-((Mes)N CMe)2 C 5 H 3 N; Mes据报道,其具有减少的单阴离子吡啶(二亚胺)配体,即2,4,6-三苯甲基)。硅化试剂R 3 Si-X(R = Me,X = Cl,I,OTf,SPh; R = Ph,X = Cl)在路易斯碱(OPPh)存在的情况下有效地加成强的O U O键如图3所示,生成(R 3 SiO)2 UX 2形式的产物(OPPh 3)2(R = Me,X = I(2-OPPh 3),Cl(3-OPPh 3),SPh(5-OPPh 3),OTf(6-OPPh 3); R = Ph,X = Cl(4-OPPh 3))。在该转化过程中,还原为铀(IV)时会损失(Cp *)2和Mes PDI Me,它们各自充当单电子源。在反应中,路易斯碱起
Pentamethylcyclopentadienylselenium derivatives III. Synthesis and 77Se NMR spectroscopy of bis(pentamethylcyclopentadienyl) polyselenides, Sen(C5Me5)2 (n = 2, 3, 4)
作者:C.Matthew Bates、Christopher P. Morley
DOI:10.1016/s0022-328x(96)06830-1
日期:1997.4
of LiC5Me5 with either Se2Cl2 or elemental Se followed by oxidation leads to the formation of a mixture of the polyselenides Sen(C5Me5)2 (n = 2, 3 and 4). The 77Se-77Se coupling constants measured by NMR spectrosopy for these compounds are the largest yet reported for acyclic systems.
用Se 2 Cl 2或元素Se处理LiC 5 Me 5,然后进行氧化,导致形成多硒化物Se n(C 5 Me 5)2(n = 2、3和4)的混合物。通过NMR光谱法测得的这些化合物的77 Se- 77 Se耦合常数是无环系统中迄今最大的报道。
The pentamethylcyclopentadienyl radical: generation, electron spin resonance spectrum, and reaction kinetics
作者:Alwyn G. Davies、Janusz Lusztyk
DOI:10.1039/c39800000554
日期:——
The pentamethylcyclopentadienyl radical [a(15H) 6·4 G, a(13C) 3·5 G, g 2·0025], is formed by the photolysis of pentamethylcyclpentadiene, and under-goes self-reaction at a diffusion-controlled rate (2kt 2 × 109 l mol–1 s–1 at 25 °C) to give the dimer which redissociates on heating.
五甲基环戊二烯基[ a(15H)6·4 G,a(13 C)3·5 G,g 2·0025]是通过五甲基环戊二烯的光分解形成的,并以扩散控制的速率进行自反应(在25°C下为2 k t 2×10 9 l mol –1 s –1)得到二聚体,该二聚体在加热时会重新结合。