Aromatische Spirane, 12. Mitt.

The title compounds26 and32 were prepared by systematic mono- and bisanellation of sixmembered rings to the positions 5,6 and 5′,6′, resp. of 2,2′-spirobiindane.SE acylation and subsequent transformations of the acylgroups afforded many derivatives with substituents in positions 4 and 4′ of the parent compounds which were required for testing semiempirical values of chirality functions.