Issue 32, 2012
From the journal:

Dalton Transactions

Selective synthesis of vitamin K3 over mesoporous NbSBA-15 catalysts synthesized by an efficient hydrothermal method†

M. Selvaraj,*a   D.-W. Park,a   I. Kim,b   S. Kawic  and  C. S. Hab  

* Corresponding authors

a School of Chemical and Biomolecular Engineering, Pusan National University, Busan 609-735, Korea
E-mail: chems@pnu.edu
Fax: +82-51-512-8563
Tel: +82-51-510-2397

b Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea

c Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 119260, Singapore

Abstract

Well hexagonally ordered NbSBA-15 catalysts synthesized by an efficient hydrothermal method were used, for the first time, for the selective synthesis of vitamin K3 by liquid-phase oxidation of 2-methyl-1-naphthol (2MN1-OH) under various reaction conditions. The recyclable NbSBA-15 catalysts were also reused to find their catalytic activities. To investigate the leaching of non-framework niobium species on the surface of silica networks, the results of original and recyclable NbSBA-15 catalysts were correlated and compared. To find an optimum condition for the selective synthesis of vitamin K3, the washed NbSBA-15(2.2pH) was extensively used in this reaction with various reaction parameters such as temperature, time and ratios of reactant (2M1N-OH to H2O2), and the obtained results were also demonstrated. Additionally, the liquid-phase oxidation of 2M1N-OH was carried out with different solvents to find the best solvent with a good catalytic activity. Based on the all catalytic studies, the vitamin K3 selectivity (97.3%) is higher in NbSBA-15(2.2pH) than that of other NbSBA-15 catalysts, and the NbSBA-15(2.2pH) is found to be a highly active and eco-friendly heterogeneous catalyst for the selective synthesis of vitamin K3.

Graphical abstract: Selective synthesis of vitamin K3 over mesoporous NbSBA-15 catalysts synthesized by an efficient hydrothermal method

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Article information

DOI
https://doi.org/10.1039/C2DT31096A
Article type
Paper
Submitted
22 May 2012
Accepted
27 Jun 2012
First published
13 Jul 2012

Dalton Trans., 2012,41, 9633-9638

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Selective synthesis of vitamin K3 over mesoporous NbSBA-15 catalysts synthesized by an efficient hydrothermal method

M. Selvaraj, D.-W. Park, I. Kim, S. Kawi and C. S. Ha, Dalton Trans., 2012, 41, 9633 DOI: 10.1039/C2DT31096A

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