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A sample of PPA with 86% H3PO4 prepared according to Uhlig [4] was used.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 137–138, January, 2009.
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Aksenova, I.V., Aksenov, A.V. & Aksenov, N.A. An original approach to the synthesis of the benzo[g]indazole heterocyclic system. Chem Heterocycl Comp 45, 117–118 (2009). https://doi.org/10.1007/s10593-009-0236-4
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DOI: https://doi.org/10.1007/s10593-009-0236-4