Han Bo, Zhang Miaomiao, Jiao Hongmei, Ma Haojie, Wang Jijiang, Zhang Yuqi
Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University Yan'an 716000 P. R. China
RSC Adv. 2021 Dec 15;11(63):39934-39939. doi: 10.1039/d1ra07266h. eCollection 2021 Dec 13.
Replacing expensive noble metals like Pt, Pd, Ir, Ru, and Rh with inexpensive earth-abundant metals like cobalt (Co) is attracting wider research interest in catalysis. Cobalt catalysts are now undergoing a renaissance in hydrogenation reactions. Herein, we describe a hydrogenation method for polycyclic aromatic hydrocarbons (PAHs) and olefins with a magnesium-activated earth-abundant Co catalyst. When diketimine was used as a ligand, simple and inexpensive metal salts of CoBr in combination with magnesium showed high catalytic activity in the site-selective hydrogenation of challenging PAHs under mild conditions. Co-catalyzed hydrogenation enabled the reduction of two side aromatics of PAHs. A wide range of PAHs can be hydrogenated in a site-selective manner, which provides a cost-effective, clean, and selective strategy to prepare partially reduced polycyclic hydrocarbon motifs that are otherwise difficult to prepare by common methods. The use of well-defined diketimine-ligated Co complexes as precatalysts for selective hydrogenation of PAHs and olefins is also demonstrated.
用钴（Co）等储量丰富的廉价金属取代铂（Pt）、钯（Pd）、铱（Ir）、钌（Ru）和铑（Rh）等昂贵的贵金属，正吸引着催化领域更广泛的研究兴趣。钴催化剂目前在氢化反应中正在复兴。在此，我们描述了一种用镁活化的储量丰富的钴催化剂对多环芳烃（PAHs）和烯烃进行氢化的方法。当二酮亚胺用作配体时，简单廉价的溴化钴金属盐与镁结合，在温和条件下对具有挑战性的多环芳烃的位点选择性氢化中表现出高催化活性。钴催化的氢化反应能够还原多环芳烃的两个侧链芳烃。多种多环芳烃可以位点选择性地氢化，这为制备部分还原的多环烃基序提供了一种经济高效、清洁且选择性的策略，而这些基序用常规方法很难制备。还展示了使用定义明确的二酮亚胺配位钴配合物作为多环芳烃和烯烃选择性氢化的预催化剂。
