Enhanced catalyst reactivity and separations using water/carbon dioxide emulsions [5]

Journal of the American Chemical Society

Volumn 121, Issue 50, 1999, Pages 11902-11903

  Jacobson, Gunilla B ^a   Lee Jr , C Ted ^b   Johnston, Keith P ^b   Tumas, William ^a  

^a LOS ALAMOS NATIONAL LABORATORY   (United States)

^b The University of Texas at Austin   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CARBON DIOXIDE; HYDROGEN; OXYGEN; TOLUENE; WATER;

CATALYSIS; CATALYST; EMULSION; HYDROGENATION; LETTER; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; SOLUBILITY;

EID: 0033596344     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja993208x     Document Type: Letter

References (26)

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2. A recent issue of Catalysis Today (1998 42 (2)) was devoted to biphasic homogeneous catalysis. Also see: Baker, R. T.; Tumas, W. Science 284, 1477-1479 1999.
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14. We found that the analogous trisulfonated ligand TPPTS also works in this system.
15. 19 Lodyne 106A was purchased from CIBA and PBO-b-PEO from PPG Industries.
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19. 13 equipped with a six-port high-pressure sampling valve to allow for reagent addition and sample analysis (via gas chromatography). Emulsions were formed from shear across a 762 μm diameter capillary tube created by a recirculating pump and the system was magnetically stirred with a stirbar kept at constant rpm for all reactions. Work investigating the effect of stirring rate is in progress. All reactions were run at 40 °C and 4000 psi with a ligand/Rh/substrate ratio of 6/1/100.
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26. 31P NMR analysis of the catalyst solutions before and after reaction demonstrated that the catalyst retains its molecular integrity with only traces of oxidized phosphine observed.