描述了金催化的原脱羧反应的机理研究。已通过实验和计算研究了每个反应步骤。更具体地说,已经通过动力学研究确定了用于脱羧步骤的活化参数。关于芳基金中间体水解的进一步实验研究表明,原脱脂可以在高转化率下与脱羧过程竞争。速率限制步骤中的此切换已显示为取决于p K a。这些研究得到了DFT计算的支持,使人们能够更好地了解反应机理的哪些普遍特征是造成脱羧过程的原因。
Synthesis and reactivity of [Au(NHC)(Bpin)] complexes
作者:Caroline M. Zinser、Fady Nahra、Laura Falivene、Marcel Brill、David B. Cordes、Alexandra M. Z. Slawin、Luigi Cavallo、Catherine S. J. Cazin、Steven P. Nolan
DOI:10.1039/c9cc03171e
日期:——
A new class of [Au(NHC)(Bpin)] complexes has been synthesized and their unusual reactivity was investigated using computational and experimental methods. The gold–boryl complexesexhibit unexpected high stability and reactivity.
Synthesis, characterisation, and oxygen atom transfer reactions involving the first gold(i)-alkylperoxo complexes
作者:Alba Collado、Adrián Gómez-Suárez、Yoshihiro Oonishi、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1039/c3cc47030j
日期:——
moiety is reported. Complexes [Au(IPr)(OO(t)Bu)] and [Au(SIPr)(OO(t)Bu)] have been synthesised via a straightforward methodology using the parent gold(I) hydroxide complexes as synthons. These complexes have been successfully used in oxygen-transfer reactions to triphenylphosphine.
Synthetic routes to [Au(NHC)(OH)] (NHC = N-heterocyclic carbene) complexes
作者:Adrián Gómez-Suárez、Rubén S. Ramón、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1039/c2dt30294b
日期:——
New procedures for the synthesis of [Au(NHC)(OH)] are reported. Initially, a two-step reaction via the digold complex [Au(NHC)}2(μ-OH)][BF4] was probed, enabling the preparation of the novel [Au(SIPr)(OH)] complex and of its previously reported congener [Au(IPr)(OH)]. After further optimization, a one-step procedure was developed.
Hydrofluorination of Alkynes Catalysed by Gold Bifluorides
作者:Fady Nahra、Scott R. Patrick、Davide Bello、Marcel Brill、Alan Obled、David B. Cordes、Alexandra M. Z. Slawin、David O'Hagan、Steven P. Nolan
DOI:10.1002/cctc.201402891
日期:2015.1
N‐heterocyclic carbene goldbifluoride complexes starting from the corresponding N‐heterocyclic carbene gold hydroxides. A new methodology to access N,N′‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene gold(I) fluoride starting from N,N′‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene gold(I) hydroxide and readily available potassium bifluoride is also reported. These goldbifluorides were shown to be efficient
Exploiting the inductive effect of the trifluoromethyl group: regioselective gold-catalyzed hydration of 2,2,2-trifluoroethyl-substituted alkynes
作者:Raphaël Gauthier、Nikolaos V. Tzouras、Steven P. Nolan、Jean-François Paquin
DOI:10.1039/d3cc02034g
日期:——
2-trifluoroethyl-substituted alkynes is highly regioselective, producing β-trifluoromethylketones as major products. This transformation illustrates the strong directing effect of the trifluoromethylgroup, through its inductive effect, in gold-catalyzed addition to alkynes.