New perfluorinated rhodium-BINAP catalysts and hydrogenation of styrene in supercritical CO2

Altinel H., Avsar G., YILMAZ M., GÜZEL B.

JOURNAL OF SUPERCRITICAL FLUIDS, cilt.51, sa.2, ss.202-208, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 51 Sayı: 2
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.supflu.2009.08.011
  • Dergi Adı: JOURNAL OF SUPERCRITICAL FLUIDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.202-208
  • Çukurova Üniversitesi Adresli: Evet

Özet

New perfluorinated BINAP ligands and their cationic rhodium complexes have been synthesized and characterized. The catalysts have been tested in homogeneous hydrogenation of the styrene in both methanol and supercritical carbon dioxide (scCO(2)). The selective hydrogenations of the styrene in scCO(2) were carried out under the same reaction conditions of 343.15 K temperature and 120 bar CO2 pressure after 3 h (molar ratio of substrate to catalyst = 500). While all catalysts showed 100% conversion in methanol, same activity was not carried out in scCO(2). (R)-6.6-diperflorooktit-2,2'-bis(diphenylphosphino)-1,1'-binaphtyl-[Rh(COD)]BArF was showed the highest conversion (96.4%) in scCO(2). Furthermore, methanol was used as co-solvent in the supercritical media in hydrogenation of styrene for the perfluorinated catalysts, which were inactive in scCO(2). Addition of methanol in scCO(2) has rather increased the conversion. (C) 2009 Elsevier B.V. All rights reserved.