Ahmed M. El-Nahas
Semiempirical (AM1 and PM3) and ab initio (MP2/6-31+G*//HF/6-31+G*) calculations on the relative stabilities of different tautomers of 2,3-dihydroxypyrazine show that this species exists not only in solution but also in the gas phase predominantly as a dioxo tautomer.