Dear All,
 I am trying to compute the most stable tautomeric form (a keto
 -iminol). I have heard it said, that in general,  heats of formation
 are not much good as the tautomers have very close values.
 Does anyone know where I could find a reference stating the above/or
 discussing it.
 Thanks in advance
 Paul Heelis
 Dr. P.Heelis
 Reader in Chemistry
 Faculty of Science and Technology
 North East Wales Institute
 Mold Rd
 Ll11 2AW