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0038403937
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N -Methylpyrrolidin-2-one Hydrotribromide (MPHT) a Mild Reagent for Selective Bromination of Carbonyl Compounds: Synthesis of Substituted 2-bromo-1-naphtols
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Bekaert, A.; Provot, O.; Rasolojaona, O.; Alami, M.; Brion, J. D. N -Methylpyrrolidin-2-one Hydrotribromide (MPHT) a Mild Reagent for Selective Bromination of Carbonyl Compounds: Synthesis of Substituted 2-bromo-1-naphtols Tetrahedron Lett. 2005, 46, 4187
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79955537666
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Preparation of PEG.KBr3 1: In a round-bottomed flask (100 mL) equipped with a magnetic stirrer, KBr (0.95 g, 8 mmol) was added to a solution of PEG400 (2 g, 5 mmol) in water (30 mL) and the mixture stirred for 4 h at room temperature. In the next step, bromine (0.8 g, 5 mmol) was added to the solution and continued the reaction under stirring for next 2-3 h. After completion, the obtained residue was extracted with dichloromethane and the combined organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The dark red viscous oil was obtained which has been used as catalyst for oxidation
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Preparation of PEG.KBr3 1: In a round-bottomed flask (100 mL) equipped with a magnetic stirrer, KBr (0.95 g, 8 mmol) was added to a solution of PEG400 (2 g, 5 mmol) in water (30 mL) and the mixture stirred for 4 h at room temperature. In the next step, bromine (0.8 g, 5 mmol) was added to the solution and continued the reaction under stirring for next 2-3 h. After completion, the obtained residue was extracted with dichloromethane and the combined organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The dark red viscous oil was obtained which has been used as catalyst for oxidation.
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35148849647
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3} n: A Unique Tribromide Type and Columnar Nanotube Like Structure for the Oxidative Coupling of Thiols and Bromination of Some Aromatic Compounds
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3} n: A Unique Tribromide Type and Columnar Nanotube Like Structure for the Oxidative Coupling of Thiols and Bromination of Some Aromatic Compounds Tetrahedron Lett. 2007, 48, 7969
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Zolfigol, M.A.1
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Salehzadeh, S.3
Adams, H.4
Ward, M.D.5
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79955547477
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General procedure for the oxidation of alcohols: In to the mixture containing substrate (1 mmol) and {[K+PEG].Br3 -} (10 mol %) was added hydrogen peroxide (2 mmol) by a syringe and the resulting mixture heated at 80°C. The reaction progress was monitored by TLC using ethyl acetate: hexane (6:4) as eluent. After completion, the product was extracted with diethyl ether and the residual aqueous layer was treated with bromine to regenerate the catalyst. The combined ether layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the oxidized products
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General procedure for the oxidation of alcohols: In to the mixture containing substrate (1 mmol) and {[K+PEG].Br3 -} (10 mol %) was added hydrogen peroxide (2 mmol) by a syringe and the resulting mixture heated at 80°C. The reaction progress was monitored by TLC using ethyl acetate: hexane (6:4) as eluent. After completion, the product was extracted with diethyl ether and the residual aqueous layer was treated with bromine to regenerate the catalyst. The combined ether layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the oxidized products.
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0141957601
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Electrophilic Aromatic Chlorination and Haloperoxidation of Chloride Catalyzed by Polyfluorinated Alcohols: A New Manifestation of Template Catalysis
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Daniel, R. B.; de Visser, S. P.; Shaik, S.; Newmann, R. Electrophilic Aromatic Chlorination and Haloperoxidation of Chloride Catalyzed by Polyfluorinated Alcohols: A New Manifestation of Template Catalysis J. Am. Chem. Soc. 2003, 125, 12116
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Daniel, R.B.1
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