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1. (WO2005105734) SEPARATION OF UNSYMMETRICAL DIIMINES BY LIQUID CHROMATOGRAPHY

Pub. No.:    WO/2005/105734    International Application No.:    PCT/US2005/014597
Publication Date: Nov 10, 2005 International Filing Date: Apr 27, 2005
IPC: C07C 249/02
C07C 251/20
Applicants: UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL
BROOKHART, Maurice, S.
KOTOV, Vasilly
Inventors: BROOKHART, Maurice, S.
KOTOV, Vasilly
Title: SEPARATION OF UNSYMMETRICAL DIIMINES BY LIQUID CHROMATOGRAPHY
Abstract:
Novel unsymmetrical diimines containing a polar group are made by preparing a mixture of the unsymmetrical diimine and two symmetrical diimines, for example by reacting a dicarbonyl compound with two primary amines. The unsymmetrical diimine is then purified by liquid chromatography. The unsymmetrical diimines are useful as ligands in olefin polymerization catalysts.