《Rational synthesis of interpenetrated 3D covalent organic frameworks for asymmetric photocatalysis》 was published in Chemical Science in 2020. These research results belong to Kang, Xing; Wu, Xiaowei; Han, Xing; Yuan, Chen; Liu, Yan; Cui, Yong. COA of Formula: C18H12Br3N The article mentions the following:
A pair of twofold interpenetrated 3D COFs adopting a rare (3,4)-connected ffc topol. for photocatalytic asym. reactions by imine condensation of rectangular and trigonal building blocks was reported. Both COFs containing a photoredox triphenylamine moiety were efficient photocatalysts for the cross-dehydrogenative coupling reactions and asym. α-alkylation of aldehydes integrated with a chiral imidazolidinone catalyst. Under visible-light irradiation, the targeted chiral products were produced in satisfactory yields with up to 94% enantiomeric excess, which were comparable to those of reported reactions using mol. metal complexes or organic dyes as photosensitizers. Whereas the COFs became amorphous after catalysis, they were recrystallized through solvent-assisted linker exchange and reused without performance loss. This was the first reported by utilizing COFs as photocatalysts to promote enantioselective photochem. reactions. In the part of experimental materials, we found many familiar compounds, such as Tris(4-bromophenyl)amine(cas: 4316-58-9COA of Formula: C18H12Br3N)
In other references, Tris(4-bromophenyl)amine(cas: 4316-58-9) is often used in the synthesis of porous luminescent covalent–organic polymers (COPs)COA of Formula: C18H12Br3N
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary