Vanadium(VIV)-Porphyrin-Based Metal-Organic Frameworks for Synergistic Bimetallic Activation of Inert C(sp3)-H Bonds

Activation and selective functionalization of inert C(sp(3))-H bonds remain one of the most challenging tasks in current synthetic chemistry. Herein, by decorating vanadium(V-IV)-porphyrin into metal-organic frameworks (MOFs) to stabilize the active tertbutyl peroxide radical, we reported a new approach to accomplish inert C(sp(3))-H bond activation by a synergistic bimetallic strategy via a hydrogen atom transfer process under mild conditions. The stabilized peroxide radical by V-IV-porphyrin-based MOFs abstracted a hydrogen atom from the inert C(sp(3))-H bonds for direct oxidization transformation utilizing environmentally friendly oxygen. Taking advantage of the high stability of Zr-6 clusters, the new Zr-MOF was recyclable six times without a conversion efficiency decrease. From this foundation, {Mn-3(mu(3)-O)} cluster nodes with potential unsaturated coordinated sites were introduced into MOFs to replace Zr-6 clusters, realizing the pre-activation of substrates through the interaction between Mn nodes and substrates. The synergistic bimetallic activation effect of V-IV-porphyrin and Mn nodes dramatically promoted the conversion efficiency and product selectivity for inert C(sp(3))-H bond functionalization.

Automated summary

In this study, the inert C(sp(3))-H bond activation was achieved by stabilizing the active tertbutyl peroxide radical with vanadium(V-IV)-porphyrin-based metal-organic frameworks (MOFs) and utilizing a synergistic bimetallic strategy via a hydrogen atom transfer process. The introduction of {Mn-3(mu(3)-O)} cluster nodes into MOFs resulted in the pre-activation of substrates, leading to enhanced conversion efficiency and product selectivity for inert C(sp(3))-H bond functionalization.