Chiroptische Eigenschaften und absolute Konfiguration von 9, 9′-Spirobifluoren-Derivaten

The circular dichroism and optical rotatory dispersion of three vespirenes, three vespirones, and of some related 9, 9′-spirobifluorene derivatives 4] have been measured. The absolute configurations of these compounds have been determined from chiroptical properties (CU., ORD.) in four ways which give mutually consistent results. For the (?)-vespirenes the (R)-configuration (Figs. 1 and 2) follows from 1 is treatment.