Abstract
Much evidence points to the fact that the long-wavelength part of the CD spectrum of chromophores of symmetry C 2 and of well-defined chirality exhibit certain common features. Calculations on a wide variety of systems predict that if the sense of screw is righthanded transitions of symmetry A will in general lead to negative Cotton-effects, transitions of symmetry B to positive ones. This apparent regularity is critically discussed for a number of different molecules and in relation with various computational approaches.
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