2,2',3,3'-Tetrahydro-1,1'-spirobi[1H-indene]-7,7'-diol

CAS 223137-87-9

SPINOL illustrates the difference between chemical purity and stereochemical composition. Two indane units share a spiro carbon, creating a framework that can exist as mirror-image forms. CAS 223137-87-9 names the diol without specifying R or S, so it should be distinguished from enantiomer-specific entries. The 1999 report introduced the framework and described resolution through chiral derivatives. Later applications used defined forms to construct more elaborate catalytic structures. Those results belong to the actual derivatives and reaction systems, rather than to every sample of the parent diol. The lesson is practical: removing unrelated impurities and separating enantiomers are different tasks. Understanding both helps connect a general molecular scaffold with the stereochemical requirements of the chemistry researchers intend to carry out using it.