The author of 《A bifunctional small molecular photocatalyst with a redox center and a Lewis acid site for one-pot tandem oxidation-acetalization》 were Rao, Cai-Hui; Ma, Shuai; Cui, Jing-Wang; Jia, Meng-Ze; Yao, Xin-Rong; Zhang, Jie. And the article was published in Green Chemistry in 2022. Electric Literature of C20H14N4 The author mentioned the following in the article:
By combining the double identity of a redox center and a Lewis acid site of the pyridinium derivative, the first bifunctional small mol. photocatalyst was developed for the one-pot tandem oxidation-acetalization reaction. A mechanism study revealed that pyridinium-mediated electron transfer and the photoactivation of mol. oxygen greatly facilitate the transformation of benzyl alcs. into the corresponding aldehydes, while the Lewis acid site of this bifunctional photocatalyst promoted a highly efficient acetalization reaction without any significant loss in activity after multiple reaction cycles, thus achieving the direct conversion of various alcs. into either cyclic or acyclic acetals in good yields under mild conditions without any additives. After reading the article, we found that the author used 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Electric Literature of C20H14N4)
4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Electric Literature of C20H14N4 Pyridine has a conjugated system of six π electrons that are delocalized over the ring.