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DOI: 10.1055/s-2005-921886
An Improved Protocol for the Synthesis and Nanofiltration of Kim and Park’s Aminocyclopentadienyl Ruthenium Chloride Racemisation Catalyst
Publikationsverlauf
Publikationsdatum:
27. Oktober 2005 (online)
Abstract
An improved synthesis of aminocyclopentadienyl ruthenium chloride catalyst 1 is reported. A combination of catalyst 1 and phosphazene base 3 is shown to effect racemisation of 1-phenylethanol. Removal of 1 and 3 by nanofiltration is a practical and effective purification method.
Key words
racemisation - ruthenium - phosphazene - nanofiltration
- 1
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References
Starmem is a trademark of W. R. Grace and Co, USA. Starmem 120 and 122 have nominal MWCO of 200 and 220 g mol-1. MWCO is determined from a plot of rejection vs. molecular weight for n-alkanes in toluene.
11Recovery of species i (Reci) is defined as the molar percentage permeated through the membrane and is calculated using Equation
[1]
:
Retention of species i (Reti) is defined as the molar percentage retained by the membrane and is calculated using Equation
[2]
, where Ci,r and Ci,p and Vr and Vp are the molar concentrations of i and volumes, respectively, in the retentate and permeate:
StarmemTM membranes and the nanofiltration cell were obtained from Membrane Extraction Technology Ltd, UK (www.membrane-extraction-technology.com).