Hydroformylation of Styrene Catalyzed by [RhH2(Ph2N3)(PPh3)2] in Dimethyl Sulfoxide
Noriyuki KAMEDA* and Tetsuya YONEDA
Department of Chemistry, College of Science and Technology, Nihon University;
Narashinodai, Funabashi-shi 274-8501 Japan
The homogeneous hydroformylation of styrene catalyzed by dihydridorhodium complex [RhH2(Ph2N3)(PPh3)2] with synthesis gas (CO/H2O=1/1) was carried out in dimethyl sulfoxide. The synthesis gas pressure was in the range from 9.8×104 to 9.8×105 Pa, and the temperature was changed from 303 to 333 K. The products were 2- and 3-phenylpropanal, 2-phenylpropanal being more abundant. Increase in the pressure of synthesis gas and addition of 1,3-diphenyltriazene or triphenylphosphine increased the yield of 2-phenylpropanal and decreased 3-phenylpropanal. When the reaction temperature was raised, 2-phenylpropanal yield reached maximum at 323 K, and then it decreased gradually. On the other hand, the formation rate of 3-phenylpropanal was accelerated by elevating the reaction temperature. The mechanism of hydroformylation reaction was discussed.
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