Efficient reductive Claisen rearrangement of prop-2'-enyloxyanthraquinones and 2'-chloroprop-2'-enyloxyanthraquinones with iron powder in ionic liquids
Synthesis and applications of highly efficient, reusable, sulfonic acid group functionalized Brönsted acidic ionic liquid catalysts
作者:Rajkumar Kore、Rajendra Srivastava
DOI:10.1016/j.catcom.2011.05.030
日期:2011.9
A variety of sulfonicacid group functionalized Brönsted acidic ionic liquids (BAILs) catalysts were synthesized. Catalytic activities of BAILs were assessed using condensation and esterification reactions. Catalytic activities of BAILs were high when compared with H-ZSM-5, H-BETA, sulfonicacidfunctionalized SBA-15 catalyst. The Hammett acidity order determined from UV–visible spectroscopy of BAILs
Novel cis-[(NHC)<sup>1</sup>(NHC)<sup>2</sup>(L)Cl]platinum(<scp>ii</scp>) complexes – synthesis, structures, and anticancer activities
作者:Tobias Rehm、Matthias Rothemund、Julienne K. Muenzner、Awal Noor、Rhett Kempe、Rainer Schobert
DOI:10.1039/c6dt02350a
日期:——
ligands. The ‘symmetric’ complexes 5a and 5b were also converted to cationic cis-[PtII(NHC)2(PPh3)Cl]+Cl− complexes 8a and 8b. The structures of the ten new complexes, comprising benzylated and alkylated imidazol-2-ylidene ligands, were analysed by 1H, 13C and 195Pt NMR spectroscopy and also by X-ray diffraction for 5a, 5d, 5h, and 8a. The neutral complexes 5 were cytotoxic against a panel of seven human
Nanohybrid materials from the intercalation of imidazolium ionic liquids in kaolinite
作者:Sadok Letaief、Christian Detellier
DOI:10.1039/b616922h
日期:——
A series of novel organic–inorganic nanohybrid materials were obtained by the intercalation in the interlamellar spaces of the clay mineral kaolinite, of ionic liquids based on imidazolium derivatives. The intercalation procedure was successfully accomplished via a melt reaction strategy using the dimethylsulfoxide–kaolinite intercalate (DMSO-K) as a precursor. 13C MAS NMR as well as XRD, TGA/DTA and FTIR studies confirmed the complete displacement of DMSO molecules by the imidazolium salts during the intercalation process. Increase of the basal spacing from 1.1 nm in DMSO-K to 1.3–1.7 nm in the nanohybrid materials was observed, indicating that imidazolium derivatives are oriented in a way such that the imidazole ring is parallel, or slightly tilted by an angle of 10–25°, with respect to the kaolinite internal surfaces. The number of moles of organic material loaded in the nanohybrids was obtained from several independent measurements. The intercalation of the imidazolium salts increases the thermal stability of the resulting material by more than 150 °C with respect to DMSO-K. After heating under air at 300 °C for two hours, XRD showed that the structure of the intercalates was kept with only a slight decrease of the intercalation ratio. The original kaolinite structure was recovered after heating the intercalate at 350 °C for an additional two hours. This observed high thermal stability is promising for the use of these nanohybrid materials as precursor for the synthesis of new nanocomposites by incorporation of polymer in kaolinite at high temperature.
Inhibition of Lactoperoxidase-Catalyzed Oxidation by Imidazole-Based Thiones and Selones: A Mechanistic Study
作者:Gouriprasanna Roy、P. N. Jayaram、Govindasamy Mugesh
DOI:10.1002/asia.201300274
日期:2013.8
N‐disubstituted thiones and selones that contain an imidazole pharmacophore. The N,N‐disubstituted thiones do not show any inhibitory activity towards LPO‐catalyzed oxidation reactions, but their corresponding N,N‐disubstituted selones exhibit inhibitory activity towards LPO‐catalyzed oxidation reactions. Substituents on the N atom of the imidazole ring appear to have a significant effect on the inhibition of LPO‐catalyzed
在本文中,我们描述了一系列包含咪唑药效基团的N,N-二取代的硫酮和色氨酸的合成和仿生活性。N,N-二取代的硫酮对LPO催化的氧化反应没有任何抑制活性,但它们相应的N,N-二取代的紫杉醇对LPO的氧化反应具有抑制作用。咪唑环N原子上的取代基似乎对LPO催化的氧化和碘化反应的抑制具有显著作用。Selones 16,17,和19,其中包含甲基,乙基,和苄基的取代基,表现出对与IC LPO催化氧化反应类似的抑制活性50个24.4,22.5,和22.5μ值中号,分别。但是,它们的活性几乎比常用的抗甲状腺药甲巯咪唑(MMI)低三倍。与此相反,selone 21,其中包含A N CH 2 CH 2 OH取代基,显示出高抑制活性,具有的IC 50值的7.2μ中号,这是类似于MMI的。这些selones对LPO催化的氧化/碘化反应的抑制活性是由于它们能够通过催化还原H 2 O 2来降低共底物(H 2 O
Chemical Detoxification of Organomercurials
作者:Mainak Banerjee、Ramesh Karri、Kuber Singh Rawat、Karthick Muthuvel、Biswarup Pathak、Gouriprasanna Roy
DOI:10.1002/anie.201504413
日期:2015.8.3
Organomercurials including methylmercury are ubiquitous environmental pollutants and highly toxic to humans. Now it could be shown that N‐methylimidazole based thiones/selones having an N‐CH2CH2OH substituent are remarkably effective in detoxifying various organomercurials to produce less toxic HgE (E=S, Se) nanoparticles. Compounds lacking the N‐CH2CH2OH substituent failed to produce HgE nanoparticles