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(A4). 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.
光学合成的化合物XXIII,XXIV和XXV,被称为vespirenes,已被合成为包含一个单一手性中心类型为X(A 4)的化合物的第一实例。制备了类似的光学活性
9,9'-螺二芴衍
生物XXI,XXVI和XXVIII,用于比较它们的手性与维维酮的手性。