摘要 标题分子的 X 射线晶体结构在冠醚区域显示出与苯并-9-冠-3 醚本身非常相似的几何形状。固相 13C NMR 化学位移差异约为 在两个芳基-O-C* 碳之间观察到 8.5 ppm,并使用先前对苯甲醚进行的 ab initio 计算结果进行解释。化学位移分配已通过使用选择性氘化衍生物进行了验证。
A comparative study of the stereochemistry of 4-acetyl-, formyl- and carboxy-benzo-9-crown-3 ether via X-ray crystallography and solid state and solution NMR spectroscopy
作者:G.W. Buchanan、M.F. Rastegar、G.P.A. Yap
DOI:10.1016/s0022-2860(00)00775-4
日期:2001.4
Abstract The X-ray crystal structures for the title molecules show remarkably similar geometries in the crown ether regions compared to benzo-9-crown-3 ether itself. Solid phase 13C NMR chemical shift differences of ca. 8.5 ppm are observed between the two aryl–O–C∗ carbons and are explained using results of ab initio calculations previously performed on anisole. Chemical shift assignments have been
摘要 标题分子的 X 射线晶体结构在冠醚区域显示出与苯并-9-冠-3 醚本身非常相似的几何形状。固相 13C NMR 化学位移差异约为 在两个芳基-O-C* 碳之间观察到 8.5 ppm,并使用先前对苯甲醚进行的 ab initio 计算结果进行解释。化学位移分配已通过使用选择性氘化衍生物进行了验证。
A novel crown ether generation containing the pyrilium heteroaromatic cation Synthesis, characterization, and solid-phase <sup>13</sup>C NMR
作者:Abolghasem Moghimi、Majid Faal Rastegar、Mehdi Ghandi
DOI:10.1139/v04-144
日期:2004.12.1
The synthesis and structural characterization of two members, 5 and 6, of a novel generation of crownetherscontaining the pyrilium cation are reported. These two compounds containtwo and three benzo-9-crown-3 (B9C3) units, respectively, connected to the 2 and 6 or 2, 4, and 6 positions of a central pyrilium cation. The crownethers 5 and 6 were obtained from the condensation reaction of appropriate