  An analysis is performed of the liquid-gas phase transition of nuclear matter
obtained from different versions of scalar derivate coupling suggested by
Zimanyi and Moszkowski (ZM) and the results are compared with those obtained
from the Walecka model. We present the phase diagram for the models and one of
them, the ZM3 model, has the lowest critical temperature $T_c=13.6$ MeV with
the lowest critical density $\rho_c=0.037$ f$m^{-3}$ and pressure $p_c=0.157$
MeV f$m^{-3}$.
  These results are in accord with recent observations from energetic heavy-ion
collisions, which suggest a small liquid-gas phase region.
