Selective photocatalytic hydroxylation and epoxidation reactions by an iron complex using water as the oxygen source
作者:Bittu Chandra、Kundan K. Singh、Sayam Sen Gupta
DOI:10.1039/c7sc02780j
日期:——
[(bTAML)FeIII–OH2]− (1) selectively catalyses the photocatalytic hydroxylation and epoxidation reactions of alkanes and alkenes, respectively, using water as the oxygen-atom source. Upon the oxidation of unactivated alkanes, which included several substrates including natural products, hydroxylation was observed mostly at the 3° C–H bonds with 3°:2° selectivity up to ∼100:1. When alkenes were used as the substrates
铁络合物[(bTAML)Fe III -OH 2 ] -(1)分别使用水作为氧原子源,分别选择性催化烷烃和烯烃的光催化羟基化和环氧化反应。在未活化的烷烃被氧化后,其中包括几种包括天然产物在内的底物,大多数情况下在3°C–H键上观察到羟基化,选择性高达3 :2 :2,直至约100 :1。当使用烯烃作为底物时,环氧化物主要以高产形成。在H存在2 18 O,90%以上的的18O标记的氧原子被掺入羟基化和环氧产物中,表明水是主要的氧源。机理研究表明,起始的复合物1通过PCET形成了活性的[(bTAML)Fe IV } 2 - μ-氧代] 2-(2)二聚体。添加底物时随后的歧化2导致形成Fe V(O),从而在这些反应中观察到高选择性。