Organic compounds -- part of the class 532-570 series – Organic compounds – Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
2007-04-17
2007-04-17
McKenzie, Thomas (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Unsubstituted hydrocarbyl chain between the ring and the -c-...
C546S116000, C549S348000
Reexamination Certificate
active
10664045
ABSTRACT:
Diketo- and pyridine-containing chiral crown ligands having at least two chiral bulky groups attached to two different chiral carbon atoms of the crown that are covalently bonded to or coated on suitable solid supports, and further coated by hydrophobic organic solvents are disclosed. These compositions and associated methods are characterized by selectivity of several target amine or amino acid enantiomers over their counter-enantiomers and derivatives. The composition preferably has an α-value greater than or equal to 4. This allows for the separation of such enantiomers with non-chromatographic resin bed separations of three separation stages or less.
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Bruening Ronald L.
Krakowiak Krzysztof E.
Covington Raymond
IBC Advanced Technologies, Inc.
McKenzie Thomas
Thorpe North & Western LLP
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