科研之友
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摘要
The synthesis of some new [4.4]cyclophane diketals, 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 structural analysis carried out by X-ray diffraction, NMR spectroscopy, and mass spectrometry shows significant intra- and intermolecular pi-pi and C-H-pi interactions. The rotation of the aromatic rings and the flipping of the bridges have been investigated by molecular modeling and variable-temperature NMR experiments.
- 出版日期2007-10
