In 2019,Organic Chemistry Frontiers included an article by Zhou, Chunhui; Hu, Jinsong; Wang, Yuan; Yao, Changguang; Chakraborty, Priyanka; Li, Huaifeng; Guan, Chao; Huang, Mei-Hui; Huang, Kuo-Wei. HPLC of Formula: 141-86-6. The article was titled 《Selective carbonylation of benzene to benzaldehyde using a phosphorus-nitrogen PN3P-rhodium(I) complex》. The information in the text is summarized as follows:
A PN3P pincer pyridinediamine ligand 2,6-(R2PNH)C5H3N (1; R = cyclopentyl, C5H5N = pyridine) bearing dicyclopentylphosphine substituents reacts with [Rh(COD)Cl]2 (COD = 1,5-cyclooctadiene) to produce the complex (PN3P)RhCl (2). Treatment of a benzene solution of 2 with KN(SiMe3)2 stimulates a dearomatization process, and C-H activation of benzene is achieved through the rearomatization of the central pyridine ring. This deprotonation/reprotonation of the NH arm of 2 gives the Ph complex (PN3P)Rh(C6H5) (3). The subsequent introduction of CO gas into 3 yields the benzoyl complex (PN3P)RhCO (C6H5) (4), which can release benzaldehyde upon treatment with diluted HCl solution and regenerates 2. The experimental part of the paper was very detailed, including the reaction process of 2,6-Diaminopyridine(cas: 141-86-6HPLC of Formula: 141-86-6)
2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.HPLC of Formula: 141-86-6