A simple and efficient in situ generated ruthenium catalyst for chemoselective transfer hydrogenation of nitroarenes: kinetic and mechanistic studies and comparison with iridium systems was written by Paul, Bhaskar;Chakrabarti, Kaushik;Shee, Sujan;Maji, Milan;Mishra, Anju;Kundu, Sabuj. And the article was included in RSC Advances in 2016.Safety of 2-Bromo-1,10-phenanthroline This article mentions the following:
The catalytic activities of a series of in-situ generated homogeneous ruthenium systems based on com. available [RuCl2(p-cymene)]2 and various ligands in transfer hydrogenation of nitroarenes to anilines were investigated. Combination of [RuCl2(p-cymene)]2 and tridentate phenanthroline based ligand 2-(6-methoxypyridin-2-yl)-1,10-phenanthroline (phenpy-OMe) exhibited the highest catalytic activity for this reaction using 2-propanol as hydrogen source. This protocol provided a facile route to access aromatic amines under mild conditions in excellent yields. Notably, this system chemoselectively reduced the nitro groups over an array of other reactive functionalities such as ketone, alkene, amide, nitrile, and aryl halide. Operational simplicity, high yields, mild reaction conditions and short reaction times make this an attractive methodol. for accessing various functionalized anilines. A series of controlled experiments and careful mechanistic investigation with the possible intermediates suggested that transformation of nitrobenzene to aniline with ruthenium and iridium system proceeded via direct route and condensation route resp. In the experiment, the researchers used many compounds, for example, 2-Bromo-1,10-phenanthroline (cas: 22426-14-8Safety of 2-Bromo-1,10-phenanthroline).
2-Bromo-1,10-phenanthroline (cas: 22426-14-8) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.Safety of 2-Bromo-1,10-phenanthroline
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary