Acyclic Tetraethynylethene Molecular Scaffolding: Multinanometer-sized linearly conjugated rods with the poly(triacetylene) backbone and cross-conjugated expanded dendralenes
作者:Armen M. Boldi、John Anthony、Volker Gramlich、Carolyn B. Knobler、Corinne Boudon、Jean-Paul Gisselbrecht、Maurice Gross、Fran�ois Diederich
DOI:10.1002/hlca.19950780402
日期:1995.6.28
different tetraethynylethene derivatives, one with a single and the other with two free terminal ethynyl groups, yielded the extended chromophores 16–21 composed of 3 or 4 tetraethynylethene moieties (Scheme 3). The linearly conjugated oligomers 16 and 17 with the PTA backbone are isomeric to 19 and 20, respectively, which are members of the cross-conjugated expanded dendralenes, i.e., dendralenes with
完全交叉共轭的四乙炔基乙烯(3,4-二乙炔基己烯-3-烯-1,5-二炔)1的衍生物是具有C骨架的多纳米尺寸分子棒的通用前体。反式-双-去保护的反式-双(三异丙基甲硅烷基)保护的四乙炔基乙2的氧化聚合(CuCl,N,N,N ',N'-四甲基乙二胺(TMEDA),O 2)在用苯乙炔封端后得到非常稳定,可溶性寡聚体3 - 7与persilylethynylated聚(triacetylene)(PTA)骨干[(CCCRCRCC)ñ],长度为19.4(3),26.8(4),34.3(5),41.8(6)和49.2(7)Å(方案1)。这些化合物易于进行单电子还原,可逆还原步骤的数量等于每个分子棒中四乙炔基乙烯部分的数量。氧化林顿-格拉塞同型耦合tetraethynylethenes的8 - 10具有单自由乙炔基提供的充分甲硅烷基保护-3,4,9,10- tetraethynyl取代十二碳-3,9-二烯-1