@article{oai:nagoya.repo.nii.ac.jp:00030129,
 author = {Chia, Wen Xi and Nishijo, Mayu and Kang, Seongsoo and Oh, Juwon and Nishimura, Tsubasa and Omori, Hiroto and Longevial, Jean‐François and Miyake, Yoshihiro and Kim, Dongho and Shinokubo, Hiroshi},
 issue = {12},
 journal = {Chemistry–A European Journal},
 month = {Feb},
 note = {N‐Alkylation significantly changes the electronic and optical properties, as well as the reactivity of nitrogen‐containing π‐conjugated molecules. In this study, it is found that treating 5,15‐diazaporphyrins with methyl triflate selectively affords the corresponding N ‐methyl‐5,15‐diazaporphyrinium cations in good yield. N‐Methylation substantially alters the electronic properties and reactivity of diazaporphyrins. The electron‐accepting properties of the N ‐methyl‐5,15‐diazaporphyrinium cations are enhanced due to their lowered LUMO level. Stabilization of the LUMO energy enables regio‐ and stereoselective Diels–Alder reactions of the cationic diazaporphyrin with cyclopentadiene. N‐Methylation also enhances the acidity of the inner NH protons, and thus, allows facile deprotonation to provide nitrogen‐substituted isoporphyrin analogues with only one NH group in the central cavity., ファイル公開：2021-02-26},
 pages = {2754--2760},
 title = {Site‐Selective N‐Methylation of 5,15‐Diazaporphyrins: Reactive Cationic Porphyrinoids that Provide Isoporphyrin Analogues},
 volume = {26},
 year = {2020}
}