Abstract
The interactions between chloroform and various alkylbenzenes have been studied by 1H n.m.r. at several temperatures. The equilibrium quotients, Kx, and thence ΔG0, ΔH0, and ΔS0, and aromatic-induced chemical shifts Δc have been deduced. The changes in ΔG0, Kx, and Δc from reaction to reaction are attributed to three effects, which are identified as an intermolecular electrostatic effect and two steric features of the aromatic compounds, qualitatively referred to as ‘trapping’ and ‘blocking’ effects of the alkyl substituents. The three effects, characterized by x, y, and z respectively, are quantified in equations for ΔG0, Kx, and Δc and their theoretical significance explained.
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