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Additional information
For Communication 4 see [1].
M. V. Lomonosov Moscow State University, Moscow 119899. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 141–142, January, 1997.
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Babaev, E.V., Bozhenko, S.V. Hetarenes with a bridge nitrogen atom. 5. Synthesis of the indolizine ring by transformation of the oxazolo[3,2-a]pyridinium cation when treated with acetylacetone. Chem Heterocycl Compd 33, 125–126 (1997). https://doi.org/10.1007/BF02290759
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DOI: https://doi.org/10.1007/BF02290759