Aromatic hydroxylation of anthracene derivatives by a chromium(<scp>iii</scp>)-superoxo complex <i>via</i> proton-coupled electron transfer
作者:Tarali Devi、Yong-Min Lee、Wonwoo Nam、Shunichi Fukuzumi
DOI:10.1039/c9cc03245b
日期:——
However, aromatic hydroxylation reactions by the metal-superoxo species are yet to be demonstrated. In this study, we report for the first time that the hydroxylation of aromatic compounds such as anthracene and its derivatives by a mononuclear nonheme Cr(III)-superoxo complex, [(Cl)(TMC)CrIII(O2)]+ (1), occurs in the presence of triflic acid (HOTf) via the rate-determining proton-coupled electron transfer
金属-超氧中间体的化学反应开始通过酶及其合成模型化合物进行氧化反应。然而,由金属-超氧物种进行的芳族羟基化反应尚未得到证实。在这项研究中,我们首次报道了单核非血红素Cr(III)-superoxo配合物[(Cl)(TMC)Cr III(O 2)] +(1)发生在三氟甲磺酸(HOTf)的存在下,通过速率确定从蒽到1的质子耦合电子转移(PCET),然后快速进一步氧化,得到蒽醌。根据马库斯电子转移理论,很好地分析了在HOTf存在下从蒽衍生物到1的电子转移速率常数。