Pressure-composition isotherms are reported for diethyl methylphosphonate and 2-chloroethyl methyl sulfide in carbon dioxide at 35, 55, and 75 degreesC. These two CO2-polar solute systems do not exhibit three-phase equilibria in the vicinity of the critical point of CO2. Pressures less than approximate to140 bar are needed to obtain a single phase for both binary mixtures at temperatures up to 75 degreesC.