10.1002/anie.199717231
The research focuses on the mechanism of (salen)Mn-catalyzed epoxidation of alkenes, a reaction of significant interest in the field of organic chemistry. The study aims to determine whether the reaction proceeds via a concerted manner, a radical intermediate, or a manganaoxetane intermediate. Through semi-empirical calculations and experiments involving substituted styrenes, the researchers concluded that the most viable mechanism involves an initial reversible formation of a metallaoxetane, which may undergo metal-carbon bond homolysis to relieve steric crowding and form a stabilized radical. This mechanism was supported by the survival of radical probes and the nonlinear Eyring effects observed. The chemicals used in the process include various metal salts (Co, Ni, Zn), 4,4'-bipyridine (4,4'-bpy), and other reagents such as acetone, ethanol, and nitrate anions. The study also explores the potential for these coordination polymers to adsorb small gaseous molecules like CH4, N2, and O2, highlighting their potential applications in molecular adsorption and catalysis.
10.1016/j.jorganchem.2009.08.014
The research explores the self-assembly of rhodium(I) metallosupramolecular structures using [RhCl(CO)2]2 as an acceptor unit. Key chemicals involved in the research include [RhCl(CO)2]2, alkynylgold complex [Au(C?CC5H4N)(CNC6H4O(O)CC6H4OC10H21)], 4-ethynylpyridine, 4,4'-bipyridine, and diphosphines such as 1,4-bis(diphenylphosphino)butane (dppb) and 1,1-bis-(diphenylphosphino)methane (dppm). The study investigates the formation of various rhodium complexes through reactions with these chemicals, resulting in the creation of mono-, bi-, and three-dimensional structures. Notably, an unexpected isonitrile transfer from gold to rhodium centers was observed, and the influence of diphosphine bite angles on the final product structures was demonstrated. The research also includes the use of PM3 semi-empirical methods to optimize the geometry of the synthesized compounds, particularly focusing on the potential applications of these structures in catalysis and molecular recognition.