Protonation Studies of the New Iron Carbonyl Cyanide trans-[Fe(CO)3(CN)2]2-: Implications with Respect to Hydrogenases
摘要:
The new iron carbonyl cyanide trans-[Fe(CN)(2)(CO)(3)](2-), [2](2-), forms in high yield via photosubstitution of Fe(CO)(5) with 2 equiv of Et4NCN. Protonation of [2](2-) generated [HFe(CN)(2)(CO)(3)](-), [2H](-), the first H-Fe-CN-CO species. Further protonation gives dihydrogen. This simple system provides insights into hydrogen evolution by the hydrogenase enzymes, which also feature H-Fe-CN-CO centers.
In this paper, we describe the silver triflate/p-toluenesulfonic acid co-catalysed synthesis of seventeen isocoumarins and two thieno[2,3-c]pyran-7-ones starting from 2-alkynylbenzoates and 3-alkynylthiophene-2-carboxylates, respectively. The reaction proceeds with absolute regioselectivity under mild reaction conditions and low catalyst loading, to afford the desired products in good to excellent
在本文中,我们描述了三氟甲磺酸银/对甲苯磺酸共催化合成17个异香豆素和两个由2-炔基苯甲酸酯和3-炔基噻吩-2-羧酸酯组成的噻吩并[2,3 - c ]吡喃-7-,分别。反应在温和的反应条件下和低的催化剂载量下以绝对的区域选择性进行,以良好至极好的收率提供所需的产物。提出了一种可能的反应机理,并得到了同位素交换试验,1 H NMR研究和特别实验的支持。
BIMP‐Catalyzed 1,3‐Prototropic Shift for the Highly Enantioselective Synthesis of Conjugated Cyclohexenones
作者:Jonathan C. Golec、Eve M. Carter、John W. Ward、William G. Whittingham、Luis Simón、Robert S. Paton、Darren J. Dixon
DOI:10.1002/anie.202006202
日期:2020.9.28
A bifunctional iminophosphorane (BIMP)‐catalysed enantioselective synthesis of α,β‐unsaturated cyclohexenones through a facially selective 1,3‐prototropic shift of β,γ‐unsaturated prochiral isomers, under mild reaction conditions and in shortreaction times, on a range of structurally diverse substrates, is reported. α,β‐Unsaturated cyclohexenone products primed for downstream derivatisation were obtained
Mechanistic Analysis of Gold(I)-Catalyzed Intramolecular Allene Hydroalkoxylation Reveals an Off-Cycle Bis(gold) Vinyl Species and Reversible C–O Bond Formation
作者:Timothy J. Brown、Dieter Weber、Michel R. Gagné、Ross A. Widenhoefer
DOI:10.1021/ja303844h
日期:2012.6.6
Mechanistic investigation of gold(I)-catalyzed intramolecular allene hydroalkoxylation established a mechanism involving rapid and reversible C-O bondformation followed by turnover-limiting protodeauration from a mono(gold) vinyl complex. This on-cycle pathway competes with catalyst aggregation and formation of an off-cycle bis(gold) vinyl complex.
金 (I) 催化的分子内丙二烯加氢烷氧基化的机理研究建立了一种机制,涉及快速和可逆的 CO 键形成,然后是单(金)乙烯基络合物的周转限制性原脱氢。这种循环途径与催化剂聚集和非循环双(金)乙烯基络合物的形成竞争。
Electronic Effects of Icosahedral Carboranes. Retentive Solvolysis of (1,2-Dicarba-<i>c</i><i>loso</i>-dodecaboran-1-yl)benzyl <i>p</i>-Toluenesulfonates
作者:Yasuyuki Endo、Takehiko Sawabe、Yoshiyuki Taoda
DOI:10.1021/ja993517n
日期:2000.1.1
Davies, Stephen G.; Simpson, Stephen J.; Felkin, Hugh, Journal of the Chemical Society, Dalton Transactions, 1983, p. 981 - 986
作者:Davies, Stephen G.、Simpson, Stephen J.、Felkin, Hugh、Tadj, Fatemeh、Watts, Oliver