Ultrasound promoted regioselective nitration of phenols using dilute nitric acid in the presence of phase transfer catalyst

Ultrasound promoted regioselective nitration of phenols using dilute nitric acid in the presence of phase transfer catalyst

Phenols are selectively nitrated to o-nitrophenol along with rate enhancement using dilute nitric acid (6 wt%)/tetra butyl ammonium bromide (TBAB) under sonication. The selectivity can also be reversed to p-nitrophenol using NaBr as a catalyst. Kinetic analysis of nitration of phenol both with and w...

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Veröffentlicht in:Ultrasonics sonochemistry 2007, Vol.14 (1), p.41-45
Hauptverfasser: Nandurkar, Nitin S., Bhanushali, Mayur J., Jagtap, Sachin R., Bhanage, Bhalchandra M.
Format: Artikel
Sprache:eng
Schlagworte:
Catalysis
Kinetics
Nitrates - chemistry
Nitrates - radiation effects
Nitration
Nitric Acid - chemistry
Nitric Acid - radiation effects
Phase transfer catalysts
Phase Transition
Phenol
Phenols - chemistry
Phenols - radiation effects
Regioselectivity
Sonication
Ultrasound
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Beschreibung
Zusammenfassung:Phenols are selectively nitrated to o-nitrophenol along with rate enhancement using dilute nitric acid (6 wt%)/tetra butyl ammonium bromide (TBAB) under sonication. The selectivity can also be reversed to p-nitrophenol using NaBr as a catalyst. Kinetic analysis of nitration of phenol both with and without sonication has been investigated by variation of reaction parameters such as catalyst, nitric acid and substrate concentration.
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2006.01.005