We plan to investigate chemical networks (up to hundreds of species,
thousands of reactions) associated with the broad field of Cosmochemistry
as applied to protoplanetary disks. These disks are most interesting as
representing planetary incubators and sites of specialized chemical
reactions (possibly of organic and pre biotic precursors). They are
complicated by a wide range of dynamic environments ranging from 20
to 2000K and number densities from 10^5 to 10^14 1/cc which, in
turn, support a very wide variety of chemical reaction time scales.
We will discuss some efforts on determining the key reaction steps
governing formation processes of observational species (CO) and
astrobiological interesting species (H2O and H2Oice).