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Woosuck Shin - One of the best experts on this subject based on the ideXlab platform.

Toshio Itoh - One of the best experts on this subject based on the ideXlab platform.

Kazumi Kato - One of the best experts on this subject based on the ideXlab platform.

Thorsten Schosser - One of the best experts on this subject based on the ideXlab platform.

  • highly selective tandem isomerization hydroformylation reaction of trans 4 octene to n Nonanal with rhodium biphephos catalysis
    Journal of Molecular Catalysis A-chemical, 2003
    Co-Authors: Arno Behr, Dietmar Obst, Christian Schulte, Thorsten Schosser
    Abstract:

    Abstract This paper describes the synthesis of n -Nonanal by a consecutive isomerization–hydroformylation reaction of trans -4-octene using a homogeneous catalyst system consisting of Rh(acac)(CO) 2 and BIPHEPHOS. In the presence of syngas these two precursor molecules form in situ the catalytically active species. At a reaction temperature of 125 °C and a syngas pressure of 20 bar the linear C 9 -aldehyde is formed in the solvent toluene in 88% yield and only few amounts of the saturated hydrocarbon and the branched C 9 -aldehydes are obtained. In comparison to industrial applications the catalyst concentration has quite a high value of 0.5 mol% based on the olefin. With a reaction-time of 4 h and a selectivity of 89%, this catalytic system can be considered as highly reactive and highly selective. Performing the reaction in propylene carbonate instead of toluene rises the selectivity to n -Nonanal from 89 up to 95%. This solvent has not only an influence on the selectivity but offers in addition the opportunity to recover the catalyst in a two-phase fluid–fluid system. In five recycling runs the catalytic phase could be reused without any loss of activity and selectivity to n -Nonanal. The resulting total turnover number had a value of 866 while the turnover frequency was 34 h −1 .

  • Highly selective tandem isomerization–hydroformylation reaction of trans-4-octene to n-Nonanal with rhodium-BIPHEPHOS catalysis
    Journal of Molecular Catalysis A-chemical, 2003
    Co-Authors: Arno Behr, Dietmar Obst, Christian Schulte, Thorsten Schosser
    Abstract:

    Abstract This paper describes the synthesis of n -Nonanal by a consecutive isomerization–hydroformylation reaction of trans -4-octene using a homogeneous catalyst system consisting of Rh(acac)(CO) 2 and BIPHEPHOS. In the presence of syngas these two precursor molecules form in situ the catalytically active species. At a reaction temperature of 125 °C and a syngas pressure of 20 bar the linear C 9 -aldehyde is formed in the solvent toluene in 88% yield and only few amounts of the saturated hydrocarbon and the branched C 9 -aldehydes are obtained. In comparison to industrial applications the catalyst concentration has quite a high value of 0.5 mol% based on the olefin. With a reaction-time of 4 h and a selectivity of 89%, this catalytic system can be considered as highly reactive and highly selective. Performing the reaction in propylene carbonate instead of toluene rises the selectivity to n -Nonanal from 89 up to 95%. This solvent has not only an influence on the selectivity but offers in addition the opportunity to recover the catalyst in a two-phase fluid–fluid system. In five recycling runs the catalytic phase could be reused without any loss of activity and selectivity to n -Nonanal. The resulting total turnover number had a value of 866 while the turnover frequency was 34 h −1 .

Yoshitake Masuda - One of the best experts on this subject based on the ideXlab platform.