ChemInform Abstract: Nitration of Benzo Crown Ethers with Potassium Nitrate in Polyphosphoric Acid.

Abstract

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Direct synthetic routes to functionalised crown ethers

“…78 Grebenyuk et al described an alternative method for the nitration of BCE and DBCE with KNO 3 and polyphosphoric acid (PPA). 79 The process was carried out using a large excess of PPA, and different stoichiometric ratios between crown ether and KNO 3 were tested; however, mixtures of mono-and di-nitro derivatives were obtained in all cases.…”

Synthesis of some novel quinone diimine derivatives of benzo‐15‐crown‐5 for application in Hg2+ recognition

“…In the present work, 4AB15C5 (2) obtained in good yield (65%). Alternatively 4AB15C5 (2) can be obtained via nitration of B15C5 (1) with potassium nitrate (33) followed by reduction using iron/NH 4 Cl. However, it is a tedious and time-consuming process.…”

Fluorescent sensing and determination of mercury (II) ions in water

“…The azo dye modified dibenzo-18-crown-6 fluorophore was synthesised according to previously reported methods (Grebenyuk et al, 2000;Pandya and Agrawal, 2002) with slight modifications. Starting from DB18C6 (1) (1.054 g, 2.9 mmol) the first step was nitration, then reduction and finally diazo coupling with β-naphthol (4) to give the final product (5) (Fig.…”