55899-55-3Relevant academic research and scientific papers
CHEMISTRY OF 1,8-SUBSTITUTED NAPHTHALENES. XIX. SYNTHESIS OF N-SUBSTITUTED 2-AMINONAPHTHOFURYLIUM SALTS
Pikus, A. L.,Mezheritskii, V. V.
, p. 150 - 154 (2007/10/02)
N-Substituted 2-aminonaphthofurylium salts were obtained by heating 8-hydroxy-1-naphthamides with phosphorus oxychloride, whereas the lactone of 8-hydroxy-1-naphthoic acid (naphtholactone) was obtained by heating in trifluoroacetic acid.With phosphorus oxychloride the amide unsubstituted at the nitrogen gives 8-hydroxy-1-naphthonitrile.In organic solvents the synthesized salts react with water and give naphtholactone or open to 8-hydroxy-1-naphthamides, depending on the concentration.The corresponding imino bases were obtained by the deprotonation of the mono-N-substituted salts.
