Synthesis of a Series of Symmetrically Disubstituted Diacetylenes with Polychlorophenyl Rings as Side Groups and Linear Polyether Chains as Spacers
作者:Esteve Hernàndez、Angels Galan、Concepció Rovira、Jaume Veciana
DOI:10.1055/s-1992-26327
日期:——
Aryl disubstituted diacetylenes with spacers of different lengths (CH2O, CH2OCH2CH2O, and CH2OCH2CH2CH2O) have been synthesized.Smaller homologues of the series were readily obtained by nucleophilic substitutions on 2,4-hexadiynylene bis(p-toluenesul-fonate). However higher homologues could not be prepared by this method from the corresponding extended bistosylates due to their low reactivities. The observed decrease of reactivity with phenoxides of such extended bistosylates is ascribed to folded conformations adopted by these derivatives. Consequently, the synthesis of higher members of the series was carried out by a multistep procedure involving appropriately functionalized monoacetylenes.
具有不同长度间隔基(CH2O、CH2OCH2CH2O 和 CH2OCH2CH2CH2O)的芳基二取代二乙炔已被合成。通过亲核取代2,4-己二炔二基双(对甲苯磺酸酯),较小的同系物系列容易获得。然而,由于其低反应性,无法通过这种方法从相应的延长双磺酸酯中制备更高同系物。观察到的这种延长双磺酸酯的酚盐反应性下降被归因于这些衍生物采用的折叠构象。因此,该系列的更高成员的合成是通过涉及适当功能化的单乙炔的多步骤程序进行的。