The importance of conformational effects on the ORD has been
nicely described by Wiberg et al. [50] for a number of 3-substituted
1-butenes. Changing the temperature shifted the experimental
ORD values which could be explained by a change in the conformer
population, e.g. of 3-chloro-1-butene. However, the calculated ORD
values of 3-chloro-1-butene were a factor of two larger compared
to experiment, independent of the wavelength in the range from
589 nm to 250 nm.