Tetraethynylethenes: Fully cross-conjugated ?-electron chromophores and molecular scaffolds for all-carbon networks and carbon-rich nanomaterials
作者:John Anthony、Armen M. Boldi、Yves Rubin、Markus Hobi、Volker Gramlich、Carolyn B. Knobler、Paul Seiler、Fran�ois Diederich
DOI:10.1002/hlca.19950780104
日期:1995.2.8
isolated in pure form, whereas derivatives with two or more free CH termini were only stable in dilute solution and polymerized rapidly in pure form. A trans-bis(triisopropylsilyl)-protected derivative represented an exception and could be isolated as stable crystals. X-Ray analysis revealed that the two bulky (i-Pr)3Si groups isolate the reactive chromophores from one another in the crystal and prevent
描述了通过新开发的合成路线制备四乙炔基乙烯(3,4-二乙炔基己基-3-烯-1,5-二炔)1以及多种多样的单,双和三保护的衍生物。这些完全交叉共轭的分子是二维全C网络和具有异常结构和电子特性的新型富含C的纳米结构的通用构建基块和前体,例如具有乙炔基化的膨胀的径向烯,或具有新型聚三乙炔骨架的分子线和聚合物。所有这些路线中的关键一步是Corey-Fuchs醛和酮的二溴代烯烃聚合。甲硅烷基保护的penta-1,4-diyn-3-ones的二溴代烯烃化反应生成相应的二溴代亚甲基衍生物,该衍生物通过两倍的Pd催化的炔烃偶联反应转化为四乙炔基乙烯衍生物。在具有游离顺式或反式-二烯炔基部分的四乙炔的路线中,醛基的二溴代烯烃化反应生成了双晶的二溴代乙烯,在与LDA消除/金属化后,再用H +淬灭或其他亲电子试剂,可以高产率产生游离或取代的乙炔基。四保护基和三保护基四乙炔基是相当稳定的化合物,可以以纯净形式分离