Fractional distribution of graphene oxide and its potential as an efficient and reusable solid catalyst for esterification reactions. (6th October 2014)

• Record Type: Journal Article
• Authors: Mungse, Harshal P.; Bhakuni, Niharika; Tripathi, Deependra; Sharma, Om P.; Sain, Bir; Khatri, Om P.
• Is Part Of: Journal of physical organic chemistry. Volume 27:Number 12(2014:Dec.)
• Page Start: 944
• Page End: 951
• Publication Date: 2014-10-06
• Subjects: Chemistry, Physical organic -- Periodicals; 547.1
• DOI: 10.1002/poc.3375
• Languages: English
• ISSNs: 0894-3230

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Graphene oxide (GrO) prepared by the Hummers method was separated into three different fractions (GrO<sub>5000</sub>, GrO<sub>2000</sub>, and GrO<sub>res</sub>) on the basis of their dispersion stability in the water. Infrared, <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">nuclear magnetic resonance</named-content>, <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">X‐ray photoelectron spectroscopy</named-content>, and elemental analyses revealed that GrO<sub>5000</sub> possesses a high degree of oxygen functionalities including phenolic, carboxylic, and −OSO<sub>2</sub>H groups, compared with the other fractions. The GrO<sub>5000</sub> was found to be a highly efficient and reusable solid catalyst for the <named-content content-type="reactionType" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">esterification</named-content> of various <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">carboxylic acids</named-content> with a variety of alcohols to furnish corresponding esters in high to excellent yields. The <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">catalytic activity</named-content> of the GrO<sub>5000</sub> was attributed to the ability of highly polar GrO<sub>5000</sub> scaffold to adsorb/attract reactants, where the acid functionalities of GrO<sub>5000</sub> facilitated the <named-content content-type="reactionType" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">esterification</named-content> process efficiently. The chemical and structural features of GrO<sub>5000</sub> were discussed to understand the improved <named-content content-type="chemicalTechnology" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">catalytic activity</named-content> compared with GrO<sub>2000</sub> and conventional solid acid catalysts. Copyright © 2014 John Wiley & Sons, Ltd.</p> </abstract>