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Solubility Measurement and Correlation of 2-Oxindole in 12 Pure Organic Solvents

The solubilities of 2-oxindole in 12 pure organic solvents including acetonitrile (MeCN), dichloromethane, 1,4-dioxane, ethyl acetate (EtOAc), acetone, toluene, methanol, ethanol, 2-propanol, tetrahydrofuran, 1-butanol, and 1-propanol were experimentally measured from (283.15 to 358.15) K at normal pressure p = 0.1 MPa by employing the synthetic method. The measured solubilities of 2-oxindole in these pure organic solvents were found to increase with the rise of temperature. The experimental solubilities of 2-oxindole were correlated with several thermodynamic models including the modified Apelblat equation, λh (Buchowski) equation, Wilson equation, and nonrandom two-liquid equation. These data could be applied for the large-scale synthesis of 2-oxindole with high purity.