The First Spirobifluorenes Containing Two Binaphthyl Moieties
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The first spirobifluorenes comprising two binaphthyl moieties with silicon or germanium at the site of fusion have been synthesized and fully characterized. X-ray crystallographic analysis reveals that both molecules have highly distorted structures, resulting in a low barrier for interconversion between the two atropisomers; the barrier was calculated from the temperature dependency of the NMR spectra.
创建时间：
2003-12-22
