
%0 Journal Article
%A Brown, DJ 
%A Teitei, T 
%T Simple pyrimidines. VII. The fine structure of 4,6-dihydroxypyrimidine
%J Australian Journal of Chemistry
%D 1964/05/01
%V 17
%N 5
%P 567-572
%K 
%R https://doi.org/10.1071/CH9640567
%U https://www.publish.csiro.au/paper/CH9640567 
%X The ultraviolet spectrum of 4,6-dihydroxypyrimidine is compared with those of N-, O-, and 5-alkylated derivatives of fixed structures corresponding to possible tautomeric forms. In contrast to earlier suggestions in the literature, it is concluded that an aqueous solution consists essentially of 1,4,5,6-tetrahydro-4,6-dioxopyrimidine in equilibrium with a smaller amount of 1,4-dihydro-6-hydroxy-4-oxo-pyrimidine. The existence of the active 6-methylene grouping within the ring is confirmed chemically by a ready condensation of benzaldehyde with the pyrimidine in aqueous solution. 
