Stereochemistry of crown ether analogs in the solid state and in solution. X-ray crystal structure, molecular mechanics calculations and nuclear magnetic resonance studies of benzo-16-crown-5
作者:G.W. Buchanan、R.C. Laister、C. Bensimon
DOI:10.1016/s0022-2860(98)00448-7
日期:1998.11
The X-ray crystal structure of the title molecule indicates that there is one `unusual' transoid O-C-C-O torsional network in the macrocyclic ring. 13 C NMR chemical shift differences between solution and solid state spectra are discussed in light of the solid state geometry. In the gas phase, calculations indicate that the X-ray crystal structure is not the most stable conformation. Rather, an optimized
摘要 标题分子的 X 射线晶体结构表明在大环中存在一个“不寻常的”transoid OCCO 扭转网络。根据固态几何学讨论了溶液和固态光谱之间的 13 C NMR 化学位移差异。在气相中,计算表明 X 射线晶体结构不是最稳定的构象。相反,优化的 X 射线结构是有利的,它保留了一个反式 OCCO 网络,但对其余三个 OCCO 部分具有显着扩展的几何形状。该结构的总能量比通过初步 MM+ 优化获得几何结构获得的结构低 0.83 kcal/mol,然后通过 AM1 方法进一步最小化。
Functionalization of 1,3-Phenylene-16-crown-5 <i>via</i> Direct Lithiation
作者:Ioannis D. Kostas、Gert-Jan M. Gruter、Otto S. Akkerman、Friedrich Bickelhaupt、Huub Kooijman、Wilberth J. J. Smeets、Anthony L. Spek
DOI:10.1021/om960431j
日期:1996.10.15
Functionalized analogues of this crown ether have not been reported previously. X-ray crystalstructures of 6, 7, and 10 were determined. According to the crystalstructure of 6, the carboxylic substituent takes part in intramolecular hydrogen bonding with a transannular crown ether oxygen (O(8)). The crystalstructure of 7 is the first one for a bis(crown ether)tin(IV) compound and reveals close proximity
Amabilino, David B.; Anelli, Pier-Lucio; Ashton, Peter R., Journal of the American Chemical Society, 1995, vol. 117, # 45, p. 11142 - 11170
作者:Amabilino, David B.、Anelli, Pier-Lucio、Ashton, Peter R.、Brown, George R.、Córdova, Emilio、Godínez, Luis A.、Hayes, Wayne、Kaifer, Angel E.、Philp, Douglas、Slawin, Alexandra M. Z.、Spencer, Neil、Stoddart, J. Fraser、Tolley, Malcolm S.、Williams, David J.
DOI:——
日期:——
KEULEN B. J. VAN; KELLOGG R. M.; PIEPERS O., J. CHEM. SOC. CHEM. COMMUN., 1979, NO 6, 285-286