Safety of (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Iridium-catalyzed asymmetric hydrogenation of pyridinium salts. Author is Ye, Zhi-Shi; Chen, Mu-Wang; Chen, Qing-An; Shi, Lei; Duan, Ying; Zhou, Yong-Gui.
A highly efficient iridium-catalyzed asym. hydrogenation of 2-substituted pyridinium salts is developed. A series of chiral 2-substituted piperidines were obtained in good to excellent yields and up to 93% ee.
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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider