Combining the Kagan method for synthesis of chiral 2-substituted ferrocenecarbaldehydes with our recent method for synthesis of 1‘-substituted formylferrocenes, we found easy access to various practically enantiomerically pure ferrocenecarbaldehydes substituted in the 2- and 1‘-positions. Furthermore, we have described a general method of synthesis of chiral ferrocenophanes. The X-ray crystal structures for three of them were determined.
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Iftime et al. (1996) studied this question.
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