Synthesis of a Stable Hexagonally Packed Mesoporous Niobium Oxide Molecular Sieve Through a Novel Ligand-Assisted Templating Mechanism
作者:David M. Antonelli、Jackie Y. Ying
DOI:10.1002/anie.199604261
日期:1996.3.1
Since the porous structure is completely retained upon surfactant removal, Nb‐TMS1, a hexagonally packed mesoporous transition metal oxide, is an interesting molecular sieve. The synthesis of this material was accomplished by a novel route in which the inorganic precursor 1 and the surfactant 2 were attached by a covalent NbN bond; this bond is probably retained throughout the course of the synthesis. equation image
US9673030B2
申请人:——
公开号:US9673030B2
公开(公告)日:2017-06-06
Nickel-catalyzed hydrogenative coupling of nitriles and amines for general amine synthesis
作者:Vishwas G. Chandrashekhar、Wolfgang Baumann、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1126/science.abn7565
日期:2022.6.24
Efficient and general methods for the synthesis of amines remain in high demand in the chemical industry. Among the many known processes, catalytic hydrogenation is a cost-effective and industrially proven reaction and currently used to produce a wide array of such compounds. We report a homogeneous nickel catalyst for hydrogenative cross coupling of a range of aromatic, heteroaromatic, and aliphatic
Investigation of Silver-Containing Layered Materials and Their Interactions with Primary Amines Using Solid-State <sup>109</sup>Ag and <sup>15</sup>N NMR Spectroscopy and First Principles Calculations
作者:Hiyam Hamaed、Andy Y. H. Lo、Leslie J. May、Jared M. Taylor、George H. Shimizu、Robert W. Schurko
DOI:10.1021/ic801549p
日期:2008.12.1
environments; hence, (1)H-(109)Ag CP/MAS NMR experiments are used to distinguish and characterize silver sites. The combination of (109)Ag and (15)N NMR experiments on starting materials and samples prepared with both (15)N-labeled and unlabeled amines permits the accurate measurements of indirect (1)J((109)Ag,(15)N) and (1)J((109)Ag,(14)N) spin-spincouplingconstants, providing further information on structure
[Ag(L)]形式(L = 4-吡啶磺酸盐或对甲苯磺酸盐)的含银层状网络用不同比例的伯胺处理。母体超分子网络的结构是众所周知的。然而,它们与伯胺的相互作用导致形成新的层状材料,而这些材料无法获得单晶X射线结构。固态(109)Ag,(15)N和(13)C交叉极化幻角旋转(CP / MAS)NMR实验与粉末X射线衍射实验和从头算相结合,可用于研究伯胺与母体材料之间的相互作用,并提出新材料的结构模型。(109)Ag化学位移(CS)张量参数对银环境的变化极为敏感;因此,(1)H-(109)Ag CP / MAS NMR实验用于区分和表征银位点。(109)Ag和(15)N NMR实验在起始原料和同时用(15)N标记和未标记的胺制备的样品上的组合可以对间接(1)J((109)Ag,(15))进行精确测量N)和(1)J((109)Ag,(14)N)自旋-自旋耦合常数,提供了有关这些系统中结构和键合的进一