The liquid-liquid coexistence for dimethyl carbonate + nonane and dimethyl carbonate + dodecane have been measured. The critical amplitudes and the critical exponents are obtained from the measured experimental data. The critical exponents corresponding to the coexistence curve beta are consistent with the 3D-Ising values. The liquid-liquid coexistence results have also been analyzed to determine Wegner-correction terms when beta and Delta are fixed at their theoretical values and to examine the diameters and the asymmetry of the coexistence curves.