Metal–Covalent Organic Frameworks: Synthetic Strategies and Catalytic Applications in Organic Transformations

Metal‐covalent organic frameworks (M‐COFs) are a class of crystalline porous materials formed by the coordination bonds between metals centers and covalent organic frameworks (COFs). They retain the characteristics of COFs while providing exposed metal active sites. Compared with homogeneous transition metal catalysts, M‐COFs exhibit superior catalytic activity, high stability, tunability, high specific surface area, and ordered pore channels. More importantly, due to their heterogeneous nature, M‐COFs catalysts can be reused multiple times conveniently, avoiding the residual presence of transition metals and reducing resource and environmental consumption. This review introduces the general design strategies and synthesis methods of M‐COFs, briefly discusses the intrinsic relationship between their structure and catalytic activity, and focuses on summarizing their applications in organic transformations. It also highlights the advantages and challenges of M‐COFs in catalyzing organic transformation reactions and discusses the future development directions in this field.