Dual-role catalysis of iridium in photo-irradiation synthesis of 9-fluorenone through intramolecular cyclization <i>via</i> hydrogen evolution
作者:Xi Hong、Yi-Wen Zhang、Bing Zhan、Xue-Juan Chen、De-Jun Hu、Zhi-Ming Li、Xiu-Feng Hou
DOI:10.1039/d3cy01353g
日期:——
the dehydrogenation. The catalyst [Ir(Fmpbo)2dtbppy]PF6 played a dual role as both the photoredox catalyst to initiate the benzoyl radical reaction and the TM catalyst to finish the aromatization and the hydrogen evolution. The photoredox/TM dual catalytic role of the Ir catalyst was proposed firstly. The reactions provide good to excellent yields of the products under mild and economic conditions.
以2-芳基苯并[ d ]恶唑基铱配合物为双用途催化剂,由[1,1'-联苯]-2-羧酸光氧化还原催化合成9-芴酮。首次发现了伴随 9-芴酮形成的不寻常的析氢反应。形成的氢的量与9-芴酮成正比,这使得反应原子经济。结合DFT计算,提出了铱催化剂的配体解离过程来解释脱氢反应。催化剂[Ir(Fmpbo) 2 dtbppy]PF 6发挥双重作用,既作为引发苯甲酰自由基反应的光氧化还原催化剂,又作为完成芳构化和析氢的TM催化剂。首次提出Ir催化剂的光氧化还原/TM双重催化作用。该反应在温和且经济的条件下提供了良好至优异的产物收率。