Process for preparing enantiomerically pure 1,1'-spirobiindane-6,6'-diol derivatives
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United States of America Patent
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May 8, 2007
Grant Date -
Jan 26, 2006
app pub date -
Jul 20, 2004
filing date -
Jul 20, 2004
priority date (Note) -
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Abstract
The present invention relates to a method for the chemical separation of the enantiomers of 1,1'-spirobiindane-6,6'-diol derivatives comprising providing a racemic chiral 1,1'-spirobiindane-6,6'-diol derivative, reacting a nonracemic chiral component with the racemic chiral 1,1'-spirobiindane-6,6'-diol derivative to afford a mixture of diastereomeric diesters, separating the mixture of diastereomeric diesters to provide a substantially pure individual diastereomeric diester, and chemically removing the ester groups from the substantially pure individual diastereomeric diester to provide a nonracemic chiral 1,1'-spirobiindane-6,6'-diol derivative.
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