The mechanisms of interaction between the deformations of the two moieties of ethane-like molecules in degenerate vibrational modes are investigated by simple methods of c]assical mechanics. Special attention is given to 7-Coriolis interaction in degenerate vibrational states, which generates first order vibration-torsion coupling. It is shown that the level splitting due to turmeling through the torsional barrier in degenerate vibrational states is strongly affected by the value of the Coriolis ( coetticient. Simple classical considerations can explain the recent experimental result that all degenerate normal modes of ethane forra Exd, E2d paired representations of the Ga6(EM) molecular symmetry group.

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