Abstract
A rule is presented which predicts the screw sense of the polymers obtained in a nickel(II)catalyzed reaction from chiral isocyanides of the type R 1R 2R 3CNC. It is based on the steric effects and on the ligand properties of R 1, R 2 and R 3. The optical rotation data on ten chiral isocyanides and their polymers verify this rule. The results suggest that the asymmetric induction of screw sense is controlled kinetically at the catalyst center. A thermodynamically controlled process appears to be less likely.
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