Enthalpies of Dissolution of Lithium Perchlorate in Diethyl Ether, Acetone, Acetonitrile, and Dimethyl Sulfoxide and Its Acceleration Effect on Cycloaddition Reactions

Abstract

The integral enthalpies of dissolution of lithium perchlorate in diethyl ether, acetone, acetonitrile, and dimethyl sulfoxide were determined by calorimetry at 298.2 K: -6.2, -9.1, -15.9, and -18.0 kcal/mol, respectively. The concentration dependence of the integral enthalpy of dissolution of lithium perchlorate in diethyl ether was established in the range from 3x10-3 to 5.6 M. The exothermic effect of dissolution in ether decreases from -6 to -5 kcal/mol at low salt concentrations (3x10-3-3x10-2 M), remains constant in the range of salt concentrations from 5x10-2-1.3 M, and then smoothly decreases to -3.2 kcal/mol at a salt concentration of 5.6 M.