  We examine the dynamics of chiral states of chiral molecules with high
tunneling rates in dilute and condensed phases in the context of time-dependent
perturbation theory. The chiral molecule is effectively described by an
asymmetric double-well potential, whose asymmetry is a measure of chiral
interactions. The dilute and condensed phases are conjointly described by a
collection of harmonic oscillators but respectively with temperature-dependent
sub-ohmic and temperature-independent ohmic spectral densities. We examine our
method quantitatively by applying the dynamics to isotopic ammonia molecule,
NHDT, in an inert background gas (as the dilute phase) and in water (as the
condensed phase). As different spectral densities implies, the extension of the
dynamics from the dilute phase to the condensed phase is not trivial. While the
dynamics in the dilute phase leads to racemization, the chiral interactions in
the condensed phase induce the quantum Zeno effect. Moreover, contrary to the
condensed phase, the short-time dynamics in the dilute phase is sensitive to
the initial state of the chiral molecule and to the strength of the coupling
between the molecule and the environment.
