作者:Gaku Yamamoto、Yasuhiro Mazaki、Ryoji Kobayashi、Hiroyuki Higuchi、Jūro Ojima
DOI:10.1039/a704071g
日期:——
An [11][13]fulvalene derivative, 13-(4,9-methanocycloundeca-2,4,6,8,10-pentaenylidene)-4,9-dimethylcyclotrideca-1,3,9,11-tetraene-5,7-diyne, has been synthesized. Examination of 1H and 13C NMR spectra indicates that the compound shows no detectable ring-current effect in nonpolar solvents arising from 10π- and 14π-electron systems, which is verified by X-ray crystallographic structural analysis. In a polar solvent, [2H6]dimethyl sulfoxide, a small contribution of the dipolar resonance structure is suggested.
已合成了[11][13]富瓦烯衍生物13-(4,9-甲桥环十一碳-2,4,6,8,10-五烯亚基)-4,9-二甲基环十三碳-1,3,9,11-四烯-5,7-二炔。1H和13C NMR光谱检查表明,该化合物在非极性溶剂中不显示由10π和14π电子系统产生的环流效应,这一点已通过X射线晶体结构分析得到验证。在极性溶剂[2H6]二甲基亚砜中,偶极共振结构有少量贡献。