fig5

Figure 5. (A) Schematic of the preparation procedure of PAF-1-CH₂AO^[56], Copyright 2017, American Chemical Society. (a) AcOH, H₃PO₄, HCl; (b) NaCN; (c) NH₂OH; (B) The preparation process of P-C₄^[60], Copyright 2019 American Chemical Society. (a) AcOH, H₃PO₄, HCl, and paraformaldehyde; (b) tributyl phosphine and tetrahydrofuran. PAF: Porous aromatic framework.