Copper- and phosphine-free Sonogashira coupling reactions of aryl iodides catalyzed by an N,N-bis(naphthylideneimino)diethylenetriamine-functionalized polystyrene resin supported Pd(II) complex under aerobic conditions

A polymer-supported palladium(II) N,N-bis(naphthylideneimino)diethylenetriamine complex is found to be a highly active catalyst for Sonogashira coupling reactions. The reactions are performed under copper- and phosphine-free conditions in an air atmosphere. The palladium catalyst is easily separated, and can be reused several times without significant loss in catalytic activity.     

Pd-Catalyzed Heterocyclization During Sonogashira Coupling: Synthesis of 3-Aryl-substituted Imidazo[2,1-b]thiazoles

Abstract

The reaction of 4,5-diphenyl-2-propargylmercaptoimidazole with various aryl iodides catalyzed by Pd-Cu in the presence of triethylamine as base in dimethyl formamide (DMF) leads to the formation of 3-aryl-substituted imidazo[2,1-b]thiazoles.     

Using Pd-salen complex as an efficient catalyst for the copper-and solvent-free coupling of acyl chlorides with terminal alkynes under aerobic conditions

<正>The palladium-salen complex palladium(Ⅱ) N,N'-bis{[5-(triphenylphosphonium)-methyl]salicylidene}-1,2-ethanediamine chloride was found to be a highly active catalyst for the copper- and solvent-free coupling reaction of terminal alkynes with different acyl chlorides in the presence of triethylamine as base,giving excellent ynones under aerobic conditions.     

A semi‐implicit finite volume implementation of the CSF method for treating surface tension in interfacial flows

We present an implementation of Hysing's (Int. J. Numer. Meth. Fluids 2006; 51 :659–672) semi‐implicit method for treating surface tension, for finite volume models of interfacial flows. Using this method, the surface tension timestep restriction, which is often very stringent, can be exceeded by at least a factor of 5 without destabilizing the solution. The surface tension force in this method consists of an explicit part, which is the regular continuum surface force, and an implicit part which represents the diffusion of velocities induced by surface tension on fluids interfaces. The surface tension force is applied to the velocity field by solving a system of equations iteratively. Since the equations are solved only near interfaces, the computational time spent on the iterative procedure is insignificant. Copyright © 2008 John Wiley & Sons, Ltd.