Synthesis and Characterization of the Lewis Acid‐Base Complexes SbCl5 · LB (LB = ICN, BrCN, ClCN, 1/2(CN)2, NH2CN, Pyridine) – a ... The polysiloxane-immobilized thiol, amine, and thiol-mine ligand systems P-(CH2)3X (where P represents the siloxane network, XSH,NH2, ...
Lewis acid‐base adductsRaman spectroscopyhybrid DFTThomas M. KlaptkeMünchen, Department of Chemistry, Ludwig‐Maximilians‐UniversitätHeinrich NthMünchen, Department of Chemistry, Ludwig‐Maximilians‐UniversitätThomas SchüttMünchen, Department of Chemistry, Ludwig‐Maximilians‐Universität...
Synthesis and Characterization of the Lewis Acid-Base Complexes SbCl5 · LB (LB = ICN, BrCN, ClCN, 1/2(CN)2, NH2CN, Pyridine) – a Combined Theoretical and Experimental Investigation. The Crystal Structures of SbCl5 · NCCl and SbCl5 · NCCN · SbCl5 Thomas M....
Nevertheless, traditional HDO process using H2 as hydrogen source produced by water-gas-shift reaction (WGS) is energy consuming and non-selective under harsh reaction conditions (100°C∼300°C, 1 ∼30 MPa H2, and acid sites). Instead, the current work uses biomass-derived formic acid ...
Niobic acid, Nb2O5·nH2O, has been studied as a heterogeneous Lewis acid catalyst. NbO4 tetrahedra, Lewis acid sites, on Nb2O5·nH2O surface immediately form NbO4−H2O adducts in the presence of water. However, a part of the adducts ca... K Nakajima,Y Baba,R Noma,... 被引量:...
催化剂表征结果表明,乙醇首先在金属Pd活性中心发生脱氢反应得到乙醛,乙醛随后转移至UiO-66节点的Lewis酸中心(Zr-CUs),两分子乙醛缩合反应得到巴豆醛,*巴豆醛再于Pd活性中心氢化得到产品正丁醇。Pd@UiO-66催化剂在乙醇制丁醇反应中的* 性源于Pd中心和Lewis酸中心之间紧密的协同作用,而Pd纳米粒子(Pd-NPs)和Zr节点...
The relative Lewis acidities of BF3 and SO3: the enthalpies of complexation with the anionic bases F−, OH−, NH2−, CH3− and CF3−Ab initio quantum chemical calculations, literature thermochemical studies in both gas and condensed phases, and simple chemical rules and regularities are...
The main contributor to the relative differences in the Lewis acidities of BX3 for X, a halogen, is the electron affinity of BX3 with a secondary contribution from the distortion energy from planar to pyramidal BX3. The B−F bond dissociation energy of X3B−F− and the distortion ...
into Iodides 4.2 Dehydration of β-Hydroxy Carbonylic Compounds to theCorresponding α,β-Unsaturated Derivatives 4.3 Synthesis of E-Alkylidene Cycloalkanones 4.4 Hydroxacyclization of Unsaturated 3-Hydroxy Esters 5 The Origin of the High Lewis Acid Activity of CeCl3·nH2O/NaI Combination 6 ...
Although considerable progress has been made during the past decades, we notice that almost all the developed acid catalysts are capable of etherifying the HMF into EMF only under a high temperature (mostly higher than 100 °C) [25]. Traditionally, maintaining such a high temperature of the ...