  We consider several kinds of quintessence models in the framework of scale
factor duality. We show that this symmetry exists only for a very small number
of quintessence potentials. We then apply the duality transformations found to
several analytical solutions. It turns out that, in some cases, the presence of
the potential allows a smooth connection between the pre- and the post-Big Bang
phases. This may be a first step toward the resolution of the singularity
problem.
