Optisch aktive 9,9′‐Spirobifluoren‐Derivate

Abstract

Abstract The optically active compounds XXIII, XXIV, and XXV, named vespirenes, have been synthetized as first examples of compounds containing a single chirality centre of the type X(A 4 ). The analogous optically active 9,9′‐spirobifluorene derivatives XXI, XXVI, and XXVIII have been prepared for comparison of their chiroptic properties with those of vespirenes.