In this paper we report activity coefficients at infinite dilution gamma (infinity)(i) of {N-methyl-2-pyrrolidinone (NMP), or N,N-dimethylformamide (DMF), or dimethyl sulfoxide (DMSO) + 1-heptyne, or 1-octyne} using comparative ebulliometry. This work is a continuation of a study on (NMP, or DMF or DMSO + hydrocarbons). The design of the ebulliometer allows the measurement of three activity coefficients simultaneously with four ebulliometers connected to a common manifold.