Patent ID: 7214834

Claim:
A method for the chemical separation of the enantiomers of 1,1′-spirobiindane-6,6′-diol derivatives comprising: a. providing a racemic chiral 1,1′-spirobiindane-6,6′-diol derivative; b. reacting a nonracemic chiral component with said racemic chiral 1,1′-spirobiindane-6,6′-diol derivative to afford a mixture of diastereomeric diesters; c. separating said mixture of diastereomeric diesters to provide a substantially pure individual diastereomeric diester; and d. chemically removing the ester groups from said substantially pure individual diastereomeric diester to provide a nonracemic chiral 1,1′-spirobiindane-6,6′-diol derivative.