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Citation: Li Da-Gang, Xia Chun-Gu, Sun Yan-Wen, Yang Wei-Man. in situ ¹H NMR Study of Active Species of Hydroformylation Catalyst[J]. Acta Physico-Chimica Sinica, ;1996, 12(01): 71-74. doi: 10.3866/PKU.WHXB19960116 shu

in situ ¹H NMR Study of Active Species of Hydroformylation Catalyst

1.
Lanzhou Institute of Chemical Physics Academic Sinica,Lanzhou 730000

Received Date: 2 December 1994
Available Online: 15 January 1996

The rhodium-phosphine complex catalyst Rh(CO)(acac)(PPh3)(Ⅰ) for 1-hexene hydroformylation was studied under the following reaction conditions: CO/H2=1(mole rate), pressure 1.0 MPa, temperature 25-120℃, by using the pressurized in-situ 1H NMR technique. Experimental results indicated that the formation of a rhodium hydride complex from (Ⅰ) began at room temperature and its amount increased with increasing of reaction temperature. This intermediate complex began to decompose at 100℃ and disapeared completely at 120℃. The intensity change of the proton signal was parallel to catalytical activity in hydroformylation of olefins. Under pure CO pressure the proton signal of Ph-H bond was not observed. There was a 0.2 ppm difference in proton chemical shifts of Rh-H bond under pure H2 pressure and under H2+CO pressure. The results showed that the rhodium-hydride carbonyl complex is the active intermediate in the industrial hydroformylation process.
- Hydroformylation catalyst,
- Olefin hydroformylation,
- Active species,
- in-situ NMR
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in situ 1H NMR Study of Active Species of Hydroformylation Catalyst

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in situ ¹H NMR Study of Active Species of Hydroformylation Catalyst