Optical rotation particular theory

All these shortcomings are overcome by the triad theory of optical rotations (TTOR approach) The TTOR approach is a semiempirical theory of optical rotations of (arbitrary) organic compounds in the transparent region (X 300 nm for cyclopropanes). The theory may be developed in terms of expressions which have a particularly simple mathematical form and which, furthermore, meet the chemists way of thinking in terms of substituent effects . The mathematical expressions contain only formally defined elements, such as ligand-specific parameters ( rotation parameters ) 2(R ), v(R ), etc. These sub-... 

The factor b may be determined from physical theories of optical rotations (75). In particular, coupled oscillator (75), polarizability (76) or free-electron theories (77) of molar rotations in the transparent region for helical line models of molecules consisting of N interacting units i, j,. .. involve relations of the... 

Dipole moments and Kerr constants of dibenzoates of several diols are measured at 298 K. Theoretical analysis is performed with standard methods of the RIS model. Comparison of theory with experiment indicates that is almost insensitive to the conformational energies, particularly for m > 3. Kerr constants are much more sensitive to the conformational energies. Good agreement between theoretical and experimental values of both dipole moments and Kerr constants of all these compounds Is achieved by adjustement of the optical parameters and the position of the rotational isomers. 

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