Improved Synthesis of β-Ketoenamine-Linked Covalent Organic Frameworks via Monomer Exchange Reactions

β-ketoenamine-linked covalent organic frameworks (COFs) offer excellent structural versatility and outstanding aqueous stability, but their less dynamic linkages complicate obtaining samples with high crystallinity and surface areas that approach theoretical values. In contrast, imine-linked COFs are often isolated with superior materials quality. Here we synthesize several β- ketoenamine-linked COFs, including two unreported structures, with unmatched crystallinity and high surface areas by preparing the topologically equivalent imine-linked COF and exchanging its triformylbenzene monomers with triformylphloroglucinol.