Evaluation of entropy differences in terms of the symmetry properties of the species involved in the equilibrium is not only a pedagogically useful exercise, it is of fundamental importance in the evaluation of empirical thermodynamic data.

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Die Kondensation zwischen dem Biphenyl‐2,2′‐bis‐triphenylphosphoniummethyl‐Salz (I) und dem Biphenyl‐2,2′‐dialdehyd (II) liefert neben dem linearen Kondensat (III) zu geringen Anteilen die cyclischen Tetrabenz(12)annulene (IV) und (V).