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Silica functionalized Cu(II) catalysed selective oxidation of benzyl alcohols using TEMPO and molecular oxygen as an oxidant

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Abstract

A general scheme for the oxidation of benzyl alcohols catalyzed by silica functionalized copper (II) has been designed. TEMPO, a free radical, assists this oxidation that was initiated by molecular oxygen which converts it to a primary oxidant. This catalytic combination i.e. SiO2-Cu(II) in presence of TEMPO and oxygen provides excellent results in terms of yields and reaction time. SiO2-Cu(II) was very well characterized by different spectroscopic techniques such as FTIR, XRD, TGA, XPS, EDAX, SEM, TEM and AAS and is recyclable upto five times which makes it economically beneficial.

This work deals with the oxidation of benzyl alcohols catalyzed by silica functionalized copper (II) and co-catalyzed by TEMPO using molecular oxygen as an oxidant. The catalytic system works very selectively and exclusively forming only aldehydes.

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Acknowledgements

We are grateful to Director, SAIF, Punjab University, Chandigarh for TEM and XRD and also to Head, SAIF, IIT Bombay for recording SEM images and also EDAX measurements. We are also thankful to Head, SAIF, IIT Roorkee for thermogravimetric analysis. We extend our sincere thanks to UGC, New Delhi for financial support to purchase FTIR; awarding Major Research Project (F 41-281/2012 (SR).

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Authors and Affiliations

  1. Department of Chemistry, University of Jammu, Jammu-, 180 006, India

    MANJULLA GUPTA, PANKAJ SHARMA, MONIKA GUPTA & RAJIVE GUPTA

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  1. MANJULLA GUPTA
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  2. PANKAJ SHARMA
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Correspondence to MONIKA GUPTA.

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Supplementary Information

Characterization of SiO2-Cu(II) and spectral details of all the compounds (3a-3n). Supplementary Information is available at www.ias.ac.in/chemsci.

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GUPTA, M., SHARMA, P., GUPTA, M. et al. Silica functionalized Cu(II) catalysed selective oxidation of benzyl alcohols using TEMPO and molecular oxygen as an oxidant. J Chem Sci 127, 1485–1489 (2015). https://doi.org/10.1007/s12039-015-0902-2

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  • DOI: https://doi.org/10.1007/s12039-015-0902-2

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