Citation:
ZHANG Ming-Xiao, LI Xue-Gang. One-pot Synthesis of 5-Hydroxy-1,4-naphthoquinones from Acetic Anhydride,Hydrogen Peroxide and 1,5-Dihydroxy Naphthalene[J]. Chinese Journal of Applied Chemistry,
;2007, 24(12): 1470-1472.
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5-Hydroxy-1,4-naphthoquinone was synthesized in one pot by dropping methanol solution of 1,5-dihydroxy naphthalene to peroxyacetic acid formed from acetic anhydride and hydrogen peroxide without H2SO4 with a yield of 68%.The product was purified by recrystallization from benzene,and its structure was confirmed by HPLC,UV,FTIR,1H NMR and 13C NMR.The reaction conditions,such as the ratio of the reactants,reaction temperature and reaction time,were optimized.The optimum molar ratio was 1:4:8 of 1,5-dihydroxy naphthalene,acetic anhydride and hydrogen peroxide.The reaction temperature was 40~60℃ and the reaction time 5.5 h.The results suggest that the one-pot-method is an efficient and convenient synthesis approach of juglone without using H2SO4 and purification of peroxyacetic acid by vacuum distillation.
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Keywords:
- Juglone,
- hydroxy-naphthoquinones,
- one-pot-method,
- synthesis
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