Absolute stereochemistries of -2,3-disubstituted spirocyclopropane-1,9′-fluorene derivatives: A styryl modification cd-method for carboxyl substituted chiral centers
Absolute stereochemistries of -2,3-di substituted spirocyclopropane-1,9′- fluorene derivatives were determined by both CD and chemical transformation methods. In the CD-study, a styryl modification method for carboxyl substituted chiral centers is presented.