Basicity of Pyridine and Some Substituted Pyridines in Ionic Liquids
作者:Guido Angelini、Paolo De Maria、Cinzia Chiappe、Antonella Fontana、Marco Pierini、Gabriella Siani
DOI:10.1021/jo100570x
日期:2010.6.4
equilibrium constants for ion pair formation of some pyridines have been evaluated by spectrophotometric titration with trifluoroacetic acid in different ionic liquids. The basicity order is the same in ionic liquids and in water. The substituent effect on the equilibrium constant has been discussed in terms of the Hammett equation. Pyridinebasicity appears to be less sensitive to the substituent effect
Reactivity of 1,1,2,2-tetraaryldsilanes as a radical reagent in ethanol was studied in reduction of alkyl bromides, addition to olefins and alkylation onto heteroaromatic bases with alkyl bromides. The present organodisilanes showed moderate to good reactivities for these three types of radical reactions. Among some disilanes prepared, 1,1,2,2-tetraphenyldisilane is the most useful in view of its reactivity and ease of preparation. (C) 1999 Elsevier Science Ltd. All rights reserved.