- Fabrication of magnetically separable ruthenium nanoparticles decorated on channelled silica microspheres: Efficient catalysts for chemoselective hydrogenation of nitroarenes
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Fe3O4-SiO2microspheres were synthesized by a three-step synthetic procedure involving silica coating, surface capping, and surface modification. These magnetic mesoporous microspheres were employed as sorbents for the incorporation of ultrasmall Ru nanoparticles (2-5 nm) followed by thermal aggregation of the microspheres for achieving better heterogeneity and low leaching. The Ru decorated Fe3O4-SiO2microspheres (Ru@Fe3O4-CSM) were applied as chemoselective catalysts to convert more than 20 substituted nitroarenes to corresponding amines with good-to-excellent conversion (77-99%) and selectivity (70-100%) under mild conditions; the catalyst can be magnetically recovered within a frame of 90s (recovery time-lapse) and reused up to 5 times without significant decrease in activity or selectivity. Magnetic hysteresis studies were performed to elucidate the magnetic behavior of the ruthenium decorated materials.
- Das, Manash R.,Das, Pankaj,Kalita, Gauravjyoti D.
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p. 13483 - 13496
(2021/10/12)
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- PYRAZOLO[1,5a]PYRIMIDINE DERIVATIVES AS IRAK4 MODULATORS
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Compounds of the formula I or II: wherein X, m, Ar, R1 and R2 are as defined herein. The subject compounds are useful for treatment of IRAK-mediated conditions.
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Page/Page column 87
(2012/02/01)
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- Guanidinium nitrate: A novel reagent for aryl nitrations
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Nitration of various aromatic compounds utilising guanidinium nitrate in 85% sulfuric acid as a nitrating agent has been studied.
- Ramana,Malik,Parihar
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p. 8681 - 8683
(2007/10/03)
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- Nitroarylamines via the Vicarious Nucleophilic Substitution of Hydrogen: Amination, Alkylamination, and Arylamination of Nitroarenes with Sulfenamides
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A new reaction of sulfenamides with electrophilic arenes under basic conditions is described. The σ adducts formed from nitroarenes and the anions of sulfenamides undergo elimination of thiol to produce the corresponding o- and/or p-nitroanilines. This reaction is analogous to the known alkylation and hydroxylation of nitroarenes via the vicarious nucleophilic substitution of hydrogen (VNS). The reaction gives access to a wide range of substituted nitroanilines, nitronaphthylamines, and aminoheterocycles. By means of the reaction with N-alkyl- and N-arylsulfenamides, it is possible to obtain N-alkylnitroanilines and nitrodiarylamines. By varying the structure of sulfenamide and the reaction conditions, particularly the nature and concentration of the base, it is possible to control the orientation of animation.
- Makosza, Mieczyslaw,Bialecki, Maciej
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p. 4878 - 4888
(2007/10/03)
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- Process for the preparation of aromatic amines
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Electrophilic aromatic compounds can be reacted with sulphenamides in the presence of bases to form the corresponding aromatic amines.
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- Anthelmintically active benzenepropanamide derivatives
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This invention is directed to a method for treating helminthiasis in an animal which method comprises administering to an animal in need thereof an anthelmintically effective amount of a compound of the Formula (I): STR1 wherein Z is oxygen or sulfur;R 1 is hydrogen or lower alkyl; andR 2, R 3, R 4 and R 5 are independently hydrogen, halo, lower haloalkyl, lower alkoxy, lower haloalkoxy, nitro, cyano, halophenoxy, haloalkylphenoxy, thiocyano or isothiocyano, provided that R 2 and R 3 cannot simultaneously be hydrogen and that R 4 and R 5 cannot simultaneously be hydrogen; or a pharmaceutically acceptable salt thereof, and pharmaceutical compositions formulated therewith. This invention is also directed to novel anthelmintically active benzenepropanamides of Formula (I) wherein Z is oxygen.
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