A General Catalyst Based on Cobalt Core–Shell Nanoparticles for the Hydrogenation of N‐Heteroarenes Including Pyridines
作者:Kathiravan Murugesan、Vishwas G. Chandrashekhar、Carsten Kreyenschulte、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1002/anie.202004674
日期:2020.9.28
core–shell based nanoparticles prepared by template synthesis of cobalt‐pyromellitic acid on silica and subsequent pyrolysis. The optimal catalyst material allows for general and selective hydrogenation of pyridines, quinolines, and other heteroarenes including acridine, phenanthroline, naphthyridine, quinoxaline, imidazo[1,2‐a]pyridine, and indole under comparably mild reaction conditions. In addition
在此,我们报道了通过二氧化硅上钴均苯四酸的模板合成和随后的热解制备的特定二氧化硅负载的Co/Co 3 O 4核壳纳米粒子的合成。最佳的催化剂材料允许在相对温和的反应条件下对吡啶、喹啉和其他杂芳烃(包括吖啶、菲咯啉、萘啶、喹喔啉、咪唑并[1,2-a]吡啶和吲哚)进行全面和选择性氢化。此外,还展示了这些钴纳米颗粒的回收利用及其脱氢催化能力。
Cu-Catalyzed Aerobic Oxidation of Di-<i>tert</i>-butyl Hydrazodicarboxylate to Di-<i>tert</i>-butyl Azodicarboxylate and Its Application on Dehydrogenation of 1,2,3,4-Tetrahydroquinolines under Mild Conditions
作者:Dahyeon Jung、Min Hye Kim、Jinho Kim
DOI:10.1021/acs.orglett.6b03166
日期:2016.12.16
developed with homogeneous CuI and di-tert-butyl azodicarboxylate for aerobic dehydrogenation of 1,2,3,4-tetrahydroquinolines under mild conditions. The developed co-catalytic system is consisting of di-tert-butyl azodicarboxylate-mediated dehydrogenation of 1,2,3,4-tetrahydroquinoline and aerobic oxidative regeneration of di-tert-butyl azodicarboxylate from di-tert-butyl hydrazodicarboxylate using molecular
synthetically versatile tetrahydroquinoline molecules with I2 and HBpin is described. In the presence of iodine (20 mol%) as a catalyst, reduction of quinolines and other N-heteroarenes proceeded readily with hydroboranes as the reducing reagents. The broad functional-group tolerance, good yields and mild reaction conditions imply high practical utility.
A Reusable Cobalt Catalyst for Reversible Acceptorless Dehydrogenation and Hydrogenation of N‐Heterocycles
作者:Garima Jaiswal、Murugan Subaramanian、Manoj K. Sahoo、Ekambaram Balaraman
DOI:10.1002/cctc.201900367
日期:2019.5.20
base‐metals for reversible acceptorless dehydrogenation (ADH) and hydrogenation of feedstock chemicals is very important in the context of ‘hydrogen storage’. Herein, we report a highly efficient reusable cobalt‐based heterogeneous catalyst for reversibledehydrogenation and hydrogenation of N‐heterocycles. Both the ADH and the hydrogenation processes operate undermild, benign conditions.
An efficient catalytic method is presented for the hydrogenation of N‐heterocycles. The iridium‐based catalyst operates under mild conditions in water without any co‐catalyst or stoichiometric additives. The catalyst also promotes the reverse reaction of dehydrogenation of N‐heterocycles, hence displaying appropriate characteristics for a future hydrogen economy based on liquid organic hydrogen carriers