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For iodine or methanol complexes with meta- and para-substituted pyridines, the blue shift Deltaeta(I2) of the visible iodine transition can be correlated with the shift of the hydroxyl stretching vibration of methanol.The deviation of ortho-substituted pyridines is proportional to the steric parameter S0.The generality of Deltaeta(I2) as a spectroscopic indicator of basicity is analyzed and it is shown that multiparametric equations predicting the reactivity of electron donor-acceptor systems are limited due to steric effects.
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Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis