Restricted Rotation Parameters from the Dipole Moments of α,ω-Dibromoparaffins

The theory of hindered rotation previously used for calculating the mean square length of polymer molecules has been combined with the Smith, Ree, Magee, and Eyring theory of the inductive effect to obtain a two-parameter expression for the dipole moment of α,ω-dibromoparaffins. The values which must be assigned to these parameters to give agreement with experiment indicate an intermediate degree of freedom of internal rotation in these molecules.