Syntheses of several 7-substituted 5-trifluoromethylpyrimido[5,4-e]-as-triazines and 1,2-dihydro-derivatives are described. The heteroaromatic compounds were usually unstable in acidic solution and each was completely covalently hydrated across the 5,6-bond at equilibrium in aqueous solution at all pH values.
J. Clark and F. S. Yates, J. Chem. Soc. C, 1971, 2475 DOI: 10.1039/J39710002475
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