Discovery of (1R,2R)-Cyclohexane-1,2-diamine

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Weak absolute helicity direction in Ni-salen by trans-cyclohexane-(1R,2R)- diamine

Helical Ni-salen foldamers were synthesized from enantiomerically pure cyclohexane-(1R,2R)-diamine, N,N?-bis-(N-phenyl (4-diphenylphosphine)-3- salicylidenato carboxamide)-(1R,2R)-cyclohexanediaminato-nickel(II). X-ray structural characterization of the absolute helicities observed confirms our earlier assertions, based on solution spectroscopic evidence, that trans-cyclohexane-diamine, a common component of chiral salen catalysts, is a weak director of absolute helicity for Ni-salen.

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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI