THE SYNTOPY MODEL AND THE TRANSITION-STAT E OF CHEMICAL-REACTIONS - MEMBERSHIP FUNCTIONS AND BRONSTED COEFFICIENTS FOR CIS-TRANS ISOMERIZATION

The previously proposed syntopy model, which provides a continuous ext ension of the symmetry concept for quasi-symmetric structures, is used to quantify the symmetry resemblance of the transition state to the i nitial and final states in chemical reactions. Cis-trans isomerization of molecules of type XYC-CYX is presented as an example, and the memb ership functions of the transition state relative to the symmetry doma ins defined by the cis-and trans-structure point groups are related to the corresponding Bronsted coefficients.