Synthetic strategies of gold(I)-selenolates from ortho-substituted diaryl diselenides via selenol and selenenyl sulfide intermediates
作者:Krishna P. Bhabak、Debasish Bhowmick
DOI:10.1016/j.ica.2016.06.022
日期:2016.8
describe the synthetic strategies to gold(I)-selenolate complexes by the reaction of ortho-substituted diaryl diselenides and electrophilic anti-arthritic gold(I)-compounds in the presence of thiol such as PhSH. Diselenides react with thiol to generate a mixture of selenol and selenenyl sulfide. While selenols react with electrophilic Au(I) compounds to form gold(I)-selenolate complexes, the selenenyl
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
from 1.34 +/- 0.02 x 10(-3) to 51 +/- 3 mol(-1) dm(3) s(-1) for P(2-OMe-C(6)H(4))(3) to PCy(3) respectively. Activation parameters range from 27 +/- 1 to 49.0 +/- 1.3 kJ mol(-1) for DeltaH(double dagger) and -112 +/- 9 to -140 +/- 3 J K(-1) mol(-1) for DeltaS(double dagger) supporting a S(N)2 mechanism in which the initial nucleophilic attack of P on Se is rate determining. Reaction rates are promoted
range for 1 between ca. −2.3 to −3.1 V (vs [Cp2Fe]0/+). Additionally, treatment of 1 with π-acids such as C≡NCy (Cy = cyclohexyl) or N≡CtBu leads to the formation of the Ti(III) and Ti(IV) products (Ketguan)(ImDippN)Ti(CN)(CNCy) (9) and (ImDippN)[(DippN)(2-iPrC6H3-6-(η1-CH3CHCH2)N)C(NCtBu2)]Ti[NC(H)tBu] (10), respectively, via reduction of the π-acid substrate. The two-electron reduction proclivity of
tris(dimethylamino)phosphine selenide, esters of selenophosphoric acid, and esters of selenophosphonic acid react with dihalogens and sulfurylchloride to form halogenoselenophosphonium salts (P–SeX)+X−. The latter undergo deselenization via ligand exchange to form phosphonium salts (P–X)+X− and elemental selenium. The stability of these salts depends on the substituents at the phosphorus atom and the type of counter
膦硒化物, 三(二甲氨基)膦硒化物, 酯类 的 硒磷酸, 和 酯类 的 硒代膦酸 与二卤素反应并 硫酰氯到形式halogenoselenophosphonium盐(P-性别)+ X - 。后者通过 配体交换形式鏻盐(P-X)+ X -和元素硒。这些盐的稳定性取决于磷原子上的取代基和抗衡离子的类型。salts盐可能与相应的equilibrium盐处于平衡状态磷烷,这证明了 酯类含有邻亚苯基配体。salts盐的结构,磷烷 和其他磷化合物的支持 31 P NMR光谱数据和电导率。其他证据来自卤代硒代phosph盐与环己烯。