Charushin, V. N. Ring transformations in reactions of heterocyclic compounds with nucleophiles. Part 26. 1,3- and 1,4-Cyclo adducts as intermediates in the pyrimidine to pyridine ring transformation of 5-nitropyrimidines by .alpha.-phenylacetamidines [Electronic resource] / V. N. Charushin, Henk C. van der Plas // Journal of Organic Chemistry. - 1983. - Vol. 48, № 16. - С. 2667-2671. - Режим доступа: http://pubs.acs.org./doi/abs/10.1021/jo00164a007. - (Дата обращения: 23.04.15)