Both axial and helical chirality are generated by complexation of the novel tetrakis(phosphanyl)terphenyl (tetraphos) ligand to a metal center (see picture). The tropos nature of the ligand was confirmed, and enantiopure Pd complexes controlled by diamines were applied as asymmetric Lewis acid catalysts in carbonyl–ene reactions.
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Aikawa et al. (2003) studied this question.
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