The fair or good yield synthesis of new [(4.4)n]cyclophanes (n = 1−5), starting from 1,4-bis(2-hydroxymethyl-5,5-dimethyl-1,3-dioxan-2-yl)benzene and several diacid−dichlorides, based on monomer and oligomer formation reactions (from 1 + 1 to 5 + 5), is reported. The structure and the complex architectures of the lattices for these cyclophanes are revealed by the X-ray molecular structure for five compounds
作者:Niculina D. Bogdan、Eric Condamine、Loïc Toupet、Yvan Ramondenc、Ioan Silaghi-Dumitrescu、Ion Grosu
DOI:10.1016/j.tetlet.2008.06.045
日期:2008.8
The synthesis, the X-ray, NMR and molecular modeling structure determination of a new orthopara[4.4]cyclophane are reported, The similarity of the pi(CO)-pi(Ar) driven conformational equilibrium of this compound to the work of an amusement ride machinery is also revealed. (C) 2008 Elsevier Ltd. All rights reserved.
New [4.4]Cyclophane Diketals, Monoketones, and Diketones: Design, Synthesis, and Structural Analysis
The synthesis of some new [4.4]cyclophanediketals, monoketones, and diketones in good yields is reported along with the unusually low reactivity towards hydrolysis of the spiro-1,3-dioxane rings connected to the cyclophane bridges. The structuralanalysis carried out by X-ray diffraction, NMR spectroscopy, and mass spectrometry shows significant intra- and intermolecular π–π and C–H–π interactions