The article "Chemical Reactions in Supercritical Carbon Dioxide"; (Wai, C. M.; Hunt, F.; Ji, M.; Chen, X. J. Chem. Educ. 1998, 75, 1641-1645) should be corrected as follows:

On page 1641 under the section Hydrogenation and Hydroformylation, the first paragraph should appear as shown below with corrections in boldface.

The work by Jessop et al. was mistakenly cited as by Leitner et al. in the article. We apologize for the mistake.

Hydrogenation and Hydroformylation

High concentrations of CO₂ in the supercritical fluid phase can be advantageous for chemical reactions that incorporate CO₂. For example, in conventional synthesis, hydrogenation of CO₂ to formic acid is rendered thermodynamically favorable by the addition of a base in an organic solvent. This reaction is highly efficient in scCO₂ (Scheme I). The hydrogenation of CO₂ to formic acid using an organic rhodium catalyst in dimethyl sulphoxide in a pressurized system was investigated by Graf and Leitner (11). Efficient production of formic acid in a supercritical mixture of CO₂ and H₂, containing a trimethylphosphine complex of Ru^II as a catalyst precursor, was reported by Jessop et al. (12). The use of a scCO₂ phase, in which hydrogen can be dissolved with a much higher concentration, leads to a very high initial rate of reactionup to 1,400 moles of formic acid per mole of catalyst per hour. The rate of the same reaction under identical conditions in liquid organic solvents is lower by an order of magnitude (12).