作者:Richard A. Hollins、Lawrence H. Merwin、Robin A. Nissan、William S. Wilson、Richard Gilardi
DOI:10.1002/jhet.5570330357
日期:1996.5
2,6-Diamino-3,5-dinitropyridine 1-oxide has been prepared by mixed acid nitration of 2,6-diaminopyridine, followed by oxidation using hydrogen peroxide in acetic acid. 3,5-Dinitro-2,4,6-triaminopyridine has been prepared by oxidative amination of 2-chloro-3,5-dinitropyridine or 2,6-diamino-3,5-dinitropyridine using potassium permanganate in liquid ammonia, or by “vicarious nucleophilic amination” of
chemistry of the new redox-active ligands 2,3,5,6-tetrakis(tetramethylguanidino)pyridine, 2,3,5,6-tetrakis(tetramethylguanidino)-p-benzoquinone and 2,3,5,6-tetrakis(N,N′-dimethyl-N,N′-ethyleneguanidino)-p-benzoquinone. All three ligands are strong electron donors. In addition, the p-benzoquinone systems feature low LUMO energies and small HOMO–LUMO gaps. A comparison of the ligands was made with regard to their
Substituted tetraamino heterocyclic compounds, useful in the preparation
申请人:Horizons Incorporated, a division of Horizons Research Incorporated
公开号:US03943125A1
公开(公告)日:1976-03-09
This invention relates to substituted tetraamino pyridines and to methods whereby such compounds are prepared. It also relates to the linear precyclized polymers produced by reaction of substituted tetraaminopyridines, or their acid salts, with a substantially equimolar amount of a suitable bis(acid halide) or dianhydride in a polar aprotic solvent at temperatures between about -10.degree.C and 70.degree.C. The resulting soluble, high molecular weight precyclized intermediates can be cyclodehydrated and may also be crosslinked to yield novel polybenzimidazoles and polyimidazopyrrolones.
Diimidazo[4,5-b:4′,5′-e]pyridine: synthesis and nucleophilic aromatic substitution reaction
作者:Dmitriy Yu. Razorenov、Sophia A. Makulova、Ivan V. Fedyanin、Konstantin A. Lyssenko、Kirill M. Skupov、Yulia A. Volkova、Ivan I. Ponomarev、Igor I. Ponomarev
DOI:10.1016/j.mencom.2019.03.022
日期:2019.3
1,7-Dihydrodiimidazo[4,5-b:4′,5′-e]pyridine obtained by reductive heterocyclization was N-arylated with 4-fluoronitrobenzene to form two regioisomers in 7 : 3 ratio. This N-arylation is considered as a model reaction for the polymer synthesis.