Coordinated carbenes from electron-rich olefins on RuHCl(PPr3i)2
作者:Joseph N. Coalter III、John C. Bollinger、John C. Huffman、Ulrike Werner–Zwanziger、Kenneth G. Caulton、Ernest R. Davidson、He´lène Ge´rard、Eric Clot、Odile Eisenstein
DOI:10.1039/a907624g
日期:——
model. Less electron-rich vinyl amides or amines form η2-olefin complexes, but do not isomerize to carbenecomplexes. Calculated ΔE values for selected ‘‘ competition’’ reactions reveal that donation by both Ru and the heteroatom-substituted X are necessary to make the carbenecomplex L2HClRuC(X)(CH3) more stable than the olefincomplex L2HClRu(η2-H2CCHX). This originates in part from a diminished
RuH 2 Cl 2 L 2 (L = PPr 3 i)的脱卤化氢得到(RuHClL 2)2,通过X射线晶体学显示为卤化物桥连的二聚体。氟化物类似物也是二聚体。(RuHClL 2)2与N 2,吡啶和C 2 H 4(L')反应生成RuHClL'L 2,但与乙烯基醚和乙烯基酰胺H 2 C CH(E)[E = OR,NRC(O )R'],这样的烯烃键合后异构化为杂原子取代的卡宾配合物L 2 HClRu C(CH 3)(E)。通过DFT(B3PW91)计算,对于作为烯烃的C 2 H 4(发现有吸热性),通过DFT(B3PW91)计算确定了这种重排的反应机理,并针对H 2 C C(H)(OCH 3)计算了中间体的结构)和环状和非环状酰胺取代的烯烃。从实验和计算上都发现,酰胺氧结合到Ru上,对于非环状模型,计算出的结合能约为9 kcal mol -1。少富电子乙烯基酰胺或胺形成η 2个烯烃配合物,但不
CALIXARENE COMPOUND AND CURABLE COMPOSITION
申请人:DIC Corporation
公开号:US20190276421A1
公开(公告)日:2019-09-12
A compound useful as a release agent, and a release agent, a curable composition, and a nanoimprint lithography resin material each containing the compound are provided. More specifically, a calixarene compound with a molecular structure represented by the following structural formula (1) and a composition containing the calixarene compound are provided.
wherein R
1
denotes a structural moiety with a perfluoroalkyl group, R
2
denotes a hydrogen atom, a polar group, a polymerizable group, or a structural moiety with a polar group or a polymerizable group, R
3
denotes a hydrogen atom, an aliphatic hydrocarbon group that may have a substituent, or an aryl group that may have a substituent, n denotes an integer in the range of 2 to 10, and * denotes a bonding point with an aromatic ring.
Hollow-structured Si/SiC@C nanospheres as highly active catalysts for cycloaddition of epoxides with CO<sub>2</sub> under mild conditions
作者:Mei-Pin Liu、Yan-Ping Luo、Lei Xu、Lin Sun、Hong-Bin Du
DOI:10.1039/c5dt04586j
日期:——
materials with high surface area not only show high adsorption capacities of industrial dyes from wastewater, but also exhibit excellent catalytic activities for chemical fixation of CO2undermild, solvent-free conditions.
中空结构的Si / SiC @ C纳米球是通过镁热还原树脂包覆的SiO 2球制备的。这些具有高表面积的纳米结构材料不仅显示出对废水中工业染料的高吸附能力,而且在温和,无溶剂的条件下对化学固定CO 2表现出出色的催化活性。
Amino acid/KI as multi-functional synergistic catalysts for cyclic carbonate synthesis from CO<sub>2</sub>under mild reaction conditions: a DFT corroborated study
作者:Kuruppathparambil Roshith Roshan、Amal Cherian Kathalikkattil、Jose Tharun、Dong Woo Kim、Yong Sun Won、Dae Won Park
DOI:10.1039/c3dt52830h
日期:——
mild, solvent free reaction conditions. The binary system of histidine/potassium iodide gave an appreciable turnover number of 535 for propyleneoxide in 3 h. Detailed studies evaluating a variety of amino acids revealed that the basic amino acids afforded better conversion rates. The formation of a seven membered ring involving the zwitterionic ends of the amino acid, the metal halide, and the epoxide
A biopolymer mediated efficient synthesis of cyclic carbonates from epoxides and carbon dioxide
作者:Kuruppathparambil Roshith Roshan、George Mathai、Juntae Kim、Jose Tharun、Gyung-Ah Park、Dae-Won Park
DOI:10.1039/c2gc35942a
日期:——
dioxide with propyleneoxide (PO) resulting in propylene carbonate (PC) under mild and solvent free conditions. A new pathway was proposed based on the density functional theory (DFT) calculations performed at the B3LYP/6-31G (d,p) level, where the carboxyl and hydroxyl moieties on the CMC were found to act synergistically with the halide ions to eventuate in the cycloaddition reaction. The carboxyl