identified (IR spectrum, melting point) as the original Co cluster catalyst. An immobile green material, which was not identified, always was present on top of the silicic acid pad.Table I summarizes the experimental details of the catalysis experiments.Infrared Studies of Hydroformylation Reaction Mixtures. In these experiments, the cooled and depressurized reactor was opened to a nitrogen atmosphere in the drybox, and a sample of the reaction mixture was placed in a 0.1-mm path length NaCl solution cell and sealed from the atmosphere. An IR spectrum was recorded of the v(CmO) region (2150-1800 cm"1) with a Perkin-Elmer 180 grating infrared spectrophotometer using toluene as the reference solvent. IR spectra also were recorded for pure PhCCo3(CO)9 and Co2(CO)8.Table II summarizes these IR data.
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