952-08-9Relevant articles and documents
Activation of Electron-Deficient Quinones through Hydrogen-Bond-Donor-Coupled Electron Transfer
Turek, Amanda K.,Hardee, David J.,Ullman, Andrew M.,Nocera, Daniel G.,Jacobsen, Eric N.
supporting information, p. 539 - 544 (2016/02/27)
Quinones are important organic oxidants in a variety of synthetic and biological contexts, and they are susceptible to activation towards electron transfer through hydrogen bonding. Whereas this effect of hydrogen bond donors (HBDs) has been observed for Lewis basic, weakly oxidizing quinones, comparable activation is not readily achieved when more reactive and synthetically useful electron-deficient quinones are used. We have successfully employed HBD-coupled electron transfer as a strategy to activate electron-deficient quinones. A systematic investigation of HBDs has led to the discovery that certain dicationic HBDs have an exceptionally large effect on the rate and thermodynamics of electron transfer. We further demonstrate that these HBDs can be used as catalysts in a quinone-mediated model synthetic transformation.
Efficient and one-pot catalytic synthesis of 2-imidazolines and bis-imidazolines with p-toluenesulfonic acid under solvent free conditions
Nasr-Esfahani, Masoud,Montazerozohori, Morteza,Mehrizi, Safie
experimental part, p. 249 - 254 (2011/05/07)
A practical, efficient, and inexpensive method for the synthesis of 2-imidazoline from the reaction of nitriles with ethylenediamine or 1,2-propanediamine using p-toluenesulfonic acid or pyridinium p-toluenesulfonate under reflux conditions is reported. This catalyst can be successfully applied for the chemoselective conversion of dicyanobenzenes to corresponding mono- and bis-imidazolines. The applications of these catalysts are feasible because of easy preparation, easy handling, stability, inexpensive, good activity, and eco-friendly.
Rapid and efficient synthesis of imidazolines and bisimidazolines under microwave and ultrasonic irradiation
Moghadam, Majid,Mohammadpoor-Baltork, Iraj,Mirkhani, Valiollah,Tangestaninejad, Shahram,Abdollahi-Alibeik, Mohammad,Yousefi, Behrooz H.,Kargar, Hadi
, p. 579 - 583 (2008/02/03)
Small assemblies of 2-imidazolines and bisimidazolines from appropriate nitriles and ethylenediamine with catalytic amounts of P2S 5 employing a microwave assisted protocol were prepared. Sonication of this system also led to successful synthesis of 2-imidazolines and bisimidazolines. Another advantage of these systems is the ability to carry out large scale reactions. Springer-Verlag 2007.