Solvent-free benzylic oxidation of aromatics over Cu(ii)-containing propylsalicylaldimine anchored on the surface of mesoporous silica catalysts

Selvaraj, Manickam and Assiri, Mohammed A. and Rokhum, Samuel Lalthazuala and Manjunatha, C. and Appaturi, Jimmy Nelson and Murugesan, Sepperumal and Bhaumik, Asim and Subrahmanyam, Challapalli (2021) Solvent-free benzylic oxidation of aromatics over Cu(ii)-containing propylsalicylaldimine anchored on the surface of mesoporous silica catalysts. Dalton Transactions, 50 (42). pp. 15118-15128. ISSN 1477-9226

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Abstract

A sustainable method was used to produce aromatic ketones by the solvent-free benzylic oxidation of aromatics over mesoporous Cu(ii)-containing propylsalicylaldimine anchored on the surface of Santa Barbara Amorphous type material-15 (CPSA-SBA-15) catalysts. For comparison, mesoporous Cu(ii)-containing propylsalicylaldimine anchored with Mobil Composition of Matter-41 (CPSA-MCM-41) was assessed for these reactions under similar reaction conditions. The washed CPSA-SBA-15(0.2) (W-CPSA-SBA-15(0.2)) catalyst was prepared using an easy chemical method for the complete removal of non-framework CuO nanoparticle species on the surface of pristine CPSA-SBA-15(0.2) (p-CPSA-SBA-15(0.2) prepared with 0.2 wt% of Cu, and its catalytic activity was evaluated with different reaction parameters, oxidants and solvents. In order to confirm the catalytic stability, the recyclability was assessed, and the performance of hot-filtration experiments was also evaluated. All the catalysts used for these catalytic reactions were characterized using many instrumental techniques to pinpoint the mesoporous nature and active sites of the catalysts. The proposed reaction mechanism has been well documented on the basis of catalytic results obtained for solvent-free oxidation of aromatics. Based on the catalytic results, we found that W-CPSA-SBA-15(0.2) is a very ecofriendly catalyst with exceptional catalytic activity. © 2021 The Royal Society of Chemistry.

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IITH Creators:

IITH Creators	ORCiD
Subrahmanyam, Challapalli	https://orcid.org/0000-0002-2643-3854

Item Type:

Article

Additional Information:

The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this study through the Large Research Group Project under grant number R.G.P. 2/139/1442.

Uncontrolled Keywords:

Aromatic ketones; Benzylic oxidation; Catalytic results; Mesoporous Cu; Mesoporous silicas; Mobil composition of matters; Santa Barbara; Silica catalyst; Solvent free; ]+ catalyst

Subjects:

Chemistry

Divisions:

Department of Chemistry

Depositing User:

. LibTrainee 2021

Date Deposited:

28 Sep 2022 08:46

Last Modified:

28 Sep 2022 08:46

URI:

http://raiithold.iith.ac.in/id/eprint/10727