根据对1,1,3,3-四甲基胍基质子离子液体(PIL)的EI-MS研究,可以得出结论,并不是所有的PIL都以分子聚集体的形式存在于气相中。对1,1,3,3-四甲基胍三氟甲基磺酸(TMGS)质子性离子液体的m / z 115.0和m / z 116.0两种离子的检测表明,分子聚集体和离子聚集体共存于气相中,就是说TMGS也可能通过离子聚集体就像非质子离子液体一样。此外,对基于三乙胺和基于1-甲基咪唑的PIL的研究证实,PIL的气相结构取决于相应酸和碱的酸度和碱性。
Triethylammonium-based protic ionic liquids with sulfonic acids: Phase behavior and electrochemistry
作者:L.E. Shmukler、M.S. Gruzdev、N.O. Kudryakova、Yu A. Fadeeva、A.M. Kolker、L.P. Safonova
DOI:10.1016/j.molliq.2018.06.059
日期:2018.9
Six triethylammonium-basedproticionicliquids (PILs) and two molten salts were synthesized via a proton transfer reaction from sulfonic acid to triethylamine (TEA). The PILs were characterized by 1H NMR, 13C NMR, 1H/15N NMR and FT-IR spectroscopic methods. The phase behavior of the PILs was studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The temperature
通过从磺酸到三乙胺(TEA)的质子转移反应合成了六种基于三乙铵的质子离子液体(PIL)和两种熔融盐。通过1 H NMR,13 C NMR,1 H / 15表征PILN NMR和FT-IR光谱法。使用差示扫描量热法(DSC)和热重分析(TGA)研究了PIL的相行为。研究了PIL的电导率,粘度和电化学稳定性窗口(ECW)的温度依赖性。三乙基三氟甲磺酸铵记录了最高的电导率和ECW值。通过三乙基铵基磺酸盐的性能,与文献数据相比较,分析了在这项工作中获得的盐的热和电化学特性。
Palladium-Catalyzed Hydride Addition/C–H Bond Activation Cascade: Cycloisomerization of 1,6-Diynes
作者:José F. Rodríguez、Katherine I. Burton、Ivan Franzoni、David A. Petrone、Ina Scheipers、Mark Lautens
DOI:10.1021/acs.orglett.8b03057
日期:2018.11.2
The use of ammonium halide salts as metal hydride precursors in a new Pd-catalyzed cycloisomerization of 1,6-diynes, which affords unexplored silylated 2-azafluorenes, is reported. This cascade process includes the addition of a Pd–hydride species to a π-system, intramolecular carbopalladation, and C(sp2)–H bond activation. A variety of functional groups are tolerated, and the synthetic utility of
Rapid and efficient protic ionic liquid-mediated pinacol rearrangements under microwave irradiation
作者:Luke C. Henderson、Nolene Byrne
DOI:10.1039/c0gc00916d
日期:——
Several protic ionic liquids were tested as potential mediators for pinacol rearrangements employing microwave irradiation. Using hydrobenzoin as a model substrate, the optimal conditions were found to be heating at 80 °C for 5 min using H2SO4:triethylamine as the ionic liquid. A key feature of this reaction was to keep the microwave power low (20 W) to avoid ionic liquid degradation. Application of these conditions to triphenylethylene glycol gave rearrangement products in high yield and purity, while phenylethylene glycol and styrene oxide gave pinacol products that underwent a cascade aldol condensation. These conditions represent an efficient means by which pinacol rearrangements can be carried out while avoiding the use of strong Brønsted acids, high temperatures and extended reaction times.
wide range of pKa differences (ΔpKa) between the parent acid and base molecules were thermally evaporated in vacuum, trapped on a CsI plate by a cryogenic neon matrix-isolation method, and studied by Fourier transform infraredspectroscopy and density functional theory calculations. The parent neutral molecules and proton-transferred cation–anion pair species were identified as chemical components
METHOD FOR PREPARING IMIDAZOLE DERIVATIVE AND INTERMEDIATE THEREOF AND CRYSTAL FORM
申请人:SHANDONG DANHONG PHARMACEUTICAL CO., LTD.
公开号:US20180141915A1
公开(公告)日:2018-05-24
Disclosed are a method for preparing an imidazole derivative and crystal form A and crystal form B thereof, and also disclosed is a method for preparing a compound of formula (I) and an intermediate thereof.