Instability of Solutions of Quaternary Ammonium Permanganates in Dichloromethane

Holba, Vladislav; Košická, Renata

doi:10.1135/cccc19970849

Cited by 5 publications

(4 citation statements)

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“…These spectral patterns are comparable with those of colloidal MnO 2 obtained by the reduction of per manganate with various reductants [12]. However, the spectra differ slightly from each other by some charac teristics such as the maximum absorbance, the λ max , the peak area etc.…”

Section: Identification Of Colloidalsupporting

confidence: 76%

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Soluble colloidal manganese dioxide: Formation, identification and prospects of application

Islam

Rahman

2013

Colloid J

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1 EXPERIMENTAL Materials and MethodsAll chemicals used in this work were of reagent grade: KMnO 4 , Na 2 S 2 O 3 ⋅ 5H 2 O, MnSO 4 ⋅ H 2 O, KI were purchased from BDH, NaHCO 3 , H 2 SO 4 , NaCl, KCl, KBr, CuSO 4 , Al 2 (SO 4 ) 3 , HCOOH were pur chased from Merck. To prepare aqueous solutions, the double distilled water was used.The absorbance measurements and spectral analy sis were carried out by using a double beam UV Visible Abstract-Soluble colloidal MnO 2 was prepared by the reduction of KMnO 4 by three reducing agents as MnSO 4 , Na 2 S 2 O 3 and HCOOH in neutral aqueous solutions at 25°C. Under suitable conditions, these solu tions were dark brown in color and found to remain stable and transparent for several weeks. The obtained colloid was characterized by spectrophotometric and coagulation methods. The spectral behavior of soluble colloidal MnO 2 was studied. The λ max was 390 nm when MnO 2 was prepared by the reduction of KMnO 4 by MnSO 4 . Both the λ max and the molar extinction coefficient depended on the method of preparation of col loidal MnO 2 . The formation of MnO 2 was confirmed by the determination of the oxidation state of Mn species in MnO 2 . The behavior of as prepared colloidal solution obeys Beer Lambert law, if the concentrations of the colloidal particles are assumed to be equal to Both spectral analysis and that using Rayleigh's law con firmed the existence of colloidal MnO 2 . The observed coagulating efficiency depends not only on the concen tration of electrolyte but also on the charge carried by the cation of the electrolyte. Stability of the colloidal par ticles in the aqueous solutions is determined by the negative charge on the surface of the colloidal particles.

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Section: Identification Of Colloidalsupporting

confidence: 76%

“…The spectrum of MnO 2 shows a broad band with a wide maximum at 400 nm covering the entire visible region, and the absorbance 1 The article is published in the original. uniformly decreases with increasing wave length [12]. The colloidal MnO 2 has been used as the autocatalyst in many reactions of permanganate [8,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Soluble colloidal manganese dioxide: Formation, identification and prospects of application

Islam

Rahman

2013

Colloid J

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“…Considering the availability of potential starting materials, we focused on the oxidation of the corresponding 4-halo-2-nitrotoluenes. A typical KMnO 4 oxidation in water afforded a 35% yield after 4 days at refluxing temperature with 6 equiv of KMnO 4 added in batches (Table − , entry 1). Various common modifications of the KMnO 4 oxidation, such as the addition of cosolvents or the employment of phase-transfer reagents, were largely unsuccessful (Table , entries 2−7).…”

Section: Resultsmentioning

confidence: 99%

Oxidation of 4-Halo-2-nitrotoluene with Tetrabutylammonium Permanganate in Pyridine: Development and Safety Evaluation

Deng

Stefanick

Pippel

et al. 2006

Org. Process Res. Dev.

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4-Halo-2-nitrobenzoic acids are synthesized by oxidation of 4-halo-2-nitrotoluene with tetrabutylammonium permanganate (TBAP) in pyridine in multigram quantities. A significant induction period is observed at room temperature, and the vigorous exothermic reaction presents the risk of a run-away reaction. By control-feeding cold TBAP into the reaction mixture at 60 °C, the initiation process is managed, and the reaction is safely performed on multigram scale. However, larger-scale reaction is NOT recommended, and use of appropriate equipments is strongly encouraged.

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“…However, the solutions of permanganate are of limited stability due to the reaction of permanganate with the solvent [4,5]. In some cases the self-oxidation of the quaternary ammonium cation takes place, too [6].…”

Section: Introductionmentioning

confidence: 98%

Kinetic study of the oxidation of benzaldehyde by quaternary ammonium permanganates in dichloromethane solutions

Košická

Holba

1998

React Kinet Catal Lett

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Instability of Solutions of Quaternary Ammonium Permanganates in Dichloromethane

Cited by 5 publications

References 0 publications

Soluble colloidal manganese dioxide: Formation, identification and prospects of application

Soluble colloidal manganese dioxide: Formation, identification and prospects of application

Oxidation of 4-Halo-2-nitrotoluene with Tetrabutylammonium Permanganate in Pyridine: Development and Safety Evaluation

Kinetic study of the oxidation of benzaldehyde by quaternary ammonium permanganates in dichloromethane solutions

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