Solvent-free Oxidation of Alcohols

[lutesium]

Solvent-free Oxidation of Alcohols by Silica Sulfuric Acid/Sodium Dichromate Dihydrate or Potassium Permanganate/Wet SiO2 System
BiBi Fatemeh Mirjalili*, Mohamad Ali Zolfigol, Abdolhamid Bamoniri, Amin Zarei, J. Chin. Chem. Soc. 51, 509-512 (2004)
https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000527562-oxidation_alcohols_solventfree.pdf" target="_blank" title="Download this file">

 
Abstract
A combination of silica sulfuric acid and sodium dichromate dihydrate or potassium permanganate in the presence of wet SiO2 was used as an effective oxidizing agent for oxidation of alcohols to their corresponding aldehydes or ketones in solvent free conditions.
 
Keyword: Silicasulfuric acid; Oxidation; Alcohols; Solvent free.

[psyloxy]

Silica Sulfuric Acid / NaNO₂ as a Novel Heterogeneous System for the Nitration of Phenols under Mild Conditions
Mohammad Ali Zolfigol, Elahe Madrakian and Ezat Ghaemi
Molecules 2002, 7, 734-742

http://www.mdpi.org/molecules/papers/71000734.pdf

Preparation of silica sulfuric acid

A 500 mL suction flask equipped with a constant-pressure dropping funnel and a gas inlet tube for conducting of HCl gas over an adsorbing solution (i.e. water) was used. It was charged with silica gel (60.0 g). Chlorosulfonic acid (23.3 g, 0.2 mol) was added dropwise over a period of 30 min at room temperature. HCl gas immediately evolved from the reaction vessel (Scheme 1). After the addition was completed the mixture was shaken for 30 min. A white solid of silica sulfuric acid (76.0 g, ~100%) was obtained.

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