+++thanks_Commander L_1 article from Sciencedirect

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A new synthesis of N-substituted о-trifluoroacetylanilines Original Research Article
Journal of Fluorine Chemistry, Volume 143, November 2012, Pages 272-280
Alexander F. Shidlovskii, Alexander S. Golubev, Dmitrii V. Gusev, Kyrill Yu. Suponitsky, Alexander S. Peregudov, Nikolai D. Chkanikov

DOI:

http://dx.doi.org/10.1016/j.jfluchem.2012.07.002

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http://www.sciencedirect.com/science/article/pii/S0022113912002412