Enantiomeric resolution
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United States of America Patent
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Aug 15, 1995
Grant Date -
N/A
app pub date -
Dec 13, 1993
filing date -
Dec 13, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for obtaining a substantially pure enantiomer of an hydrocarbyl amine is described. The process utilizes first an enantiomerically enriched mixture the of hydrocarbyl amine obtained from kinetic resolution, diastereomeric crystallization or asymmetric synthesis processes. This enriched mixture is reacted with an inorganic acid producing a salt that has the following properties: 1) has at least one eutectic point; 2) a composition that is not at the eutectic point; and 3) a eutectic composition that is closer to the racemic composition than is the eutectic composition of said hydrocarbyl, or be a solid where the salt is a liquid. A substantially pure, enantiomeric salt is separated, leaving a mother liquor comprising the solvent and the hydrocarbyl amine enriched in the other enantiomer.
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