An Improved Protocol for the Synthesis and Nanofiltration of Kim and Park’s Aminocyclopentadienyl Ruthenium Chloride Racemisation Catalyst

Emma J. Gibbins; Jacob L. Irwin; Andrew G. Livingston; Jennifer C. Muir; Darrell A. Patterson; Chayaporn Roengpithya; Paul C. Taylor

doi:10.1055/s-2005-921886

LETTER

An Improved Protocol for the Synthesis and Nanofiltration of Kim and Park’s Aminocyclopentadienyl Ruthenium Chloride Racemisation Catalyst

Emma J. Gibbins^a, Jacob L. Irwin^b, Andrew G. Livingston*^a, Jennifer C. Muir^b, Darrell A. Patterson^a, Chayaporn Roengpithya^a, Paul C. Taylor*^b
^a Department of Chemical Engineering, Imperial College, London, SW7 2AZ, UK
Fax: +44(20)75945604; e-Mail: A.Livingston@imperial.ac.uk;
^b Department of Chemistry, The University of Warwick, Coventry, CV4 7AL, UK
Fax: +44(24)76524112; e-Mail: P.C.Taylor@warwick.ac.uk.;

Abstract

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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

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References

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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.

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Recovery of species i (Rec_i) is defined as the molar percentage permeated through the membrane and is calculated using Equation [1] :
Retention of species i (Ret_i) is defined as the molar percentage retained by the membrane and is calculated using Equation [2] , where C_i,r and C_i,p and V_r and V_p are the molar concentrations of i and volumes, respectively, in the retentate and permeate:

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14

Starmem^TM membranes and the nanofiltration cell were obtained from Membrane Extraction Technology Ltd, UK (www.membrane-extraction-technology.com).