Grafting of a rhenium-oxo complex on Schiff base functionalized graphene oxide: an efficient catalyst for the oxidation of amines
作者:Praveen K. Khatri、Shivani Choudhary、Raghuvir Singh、Suman L. Jain、Om P. Khatri
DOI:10.1039/c3dt53421a
日期:——
A rhenium-oxo complex such as methyltrioxorhenium (MTO) has been homogeneously immobilized on a Schiff base modified graphene oxide (GrO) support via covalent bonding. The loading of MTO on GrO nanosheets was monitored by FTIR, TG-DTA, and elemental analyses. The developed heterogeneous catalyst is found to be efficient for the oxidation of various amines to the corresponding N-oxides using hydrogen
A Concise, Enantiospecific Total Synthesis of Chilocorine C Fueled by a Reductive Cyclization/Mannich Reaction Cascade
作者:Vladislav G. Lisnyak、Scott A. Snyder
DOI:10.1021/jacs.0c04914
日期:2020.7.15
chemoselective transformations, including a designed cascade that accomplishes 9 distinct chemical reactions in one pot, can smoothly forge that domain and ultimately enable a 15-step, 11-pot enantiospecificsynthesis of the natural product. Mechanistic studies, DFT calculations, and the delineation of several other unsuccessful approaches highlight its unique elements.
Carbon nanofibers decorated with oxo–rhenium complexes: Highly efficient heterogeneous catalyst for oxidation of amines with hydrogen peroxide
作者:Sanny Verma、Subodh Kumar、Efrat Shawat、Gilbert Daniel Nessim、Suman L. Jain
DOI:10.1016/j.molcata.2015.03.007
日期:2015.6
Pyridine functionalized carbon nanofibers (Py-CNFs) were synthesized, characterized and used for the grafting of oxo-rhenium complex i.e., methyltrioxorhenium (MTO) via acid-base ionic interaction. The grafting of MTO to Py-CNFs was confirmed by FTIR, UV-vis, SEM, TEM and TGA analyses. The determination of rhenium content by ICP-AES further suggested the successful immobilization of MTO to the support. The developed heterogeneous material i.e., MTO@Py-CNFs was found to be an efficient catalyst for the oxidation of various secondary as well as tertiary amines to corresponding nitrones or N-oxides, respectively by using hydrogen peroxide. The developed catalyst was readily recovered by centrifugation and reused for subsequent ten runs without any significant loss in catalytic activity. (C) 2015 Elsevier B.V. All rights reserved.