Journal
THEORETICAL CHEMISTRY ACCOUNTS
Volume 118, Issue 4, Pages 813-826Publisher
SPRINGER
DOI: 10.1007/s00214-007-0328-0
Keywords
symmetry numbers; chemical reactions; transition state theory; chiral molecules; multiple conformers; internal rotation
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This article shows how to evaluate rotational symmetry numbers for different molecular configurations and how to apply them to transition state theory. In general, the symmetry number is given by the ratio of the reactant and transition state rotational symmetry numbers. However, special care is advised in the evaluation of symmetry numbers in the following situations: (i) if the reaction is symmetric, (ii) if reactants and/or transition states are chiral, (iii) if the reaction has multiple conformers for reactants and/or transition states and, (iv) if there is an internal rotation of part of the molecular system. All these four situations are treated systematically and analyzed in detail in the present article. We also include a large number of examples to clarify some complicated situations, and in the last section we discuss an example involving an achiral diasteroisomer.
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