trifluoroacetic acid in 1,2-dichloro-ethane T=110°C; 4 h;
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Khimiya Geterotsiklicheskikh Soedinenii, , # 11 p. 1492 - 1495
Chemistry of Heterocyclic Compounds (New York, NY, United States), , vol. 23, # 3 p. 275 - 281
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