Two geometrical isomers of 4,5:8,9-dibenzo-2,10-cycloundecadien-6-yne were prepared by a Wittig reaction between 2,2′-diformyldiphenylacetylene and trimethylenedi(triphenylphosphonium bromide). Their stereochemical configuration, cis,trans (I) and trans,trans (II) were deduced from the nmr spectral data. Attempts to use (I) and (II) as precursors to the [11]annulenyl cation (III) have so far not been realized.
2,2′-diformyldiphenylacetylene 与三亚
甲基二(
三苯基膦溴化物)通过威蒂希反应制备了 4,5:8,9-二
苯并-2,10-环癸二
烯-6-炔的两种几何异构体。根据 nmr 光谱数据推断出它们的立体
化学构型,即顺式、反式(I)和反式、反式(II)。将 (I) 和 (II) 用作 [11]Annulenyl 阳离子 (III) 的前体的尝试迄今尚未实现。