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Environmental Friendly and Highly Regioselective Oxybromination in An Aqueous System Using SBA-15 Supported Sulfated Zirconia Catalyst

Published online by Cambridge University Press:  31 January 2011

Chen Ai-Jan ,
Chen Xiao-Rong  and
Chung-Yuan Mou
Chen Ai-Jan
Affiliation:
aijanchen@ntu.edu.tw, National Taiwan University, Department of Chemistry, Taipei, Taiwan, Province of China
Chen Xiao-Rong
Affiliation:
chen_xr@hotmail.com, Nanjing University of Technology, College of Chemistry and Chemical Engineering, Nanjing, China
Chung-Yuan Mou
Affiliation:
chung-yuan.mou@scholarone.com, National Taiwan University, Center of Condensed Matter Science, Taipei, Taiwan, Province of China
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Abstract

Brominated aromatic compounds have been widely used in synthetic organic chemistry for themanufacturing of many bulk and fine chemicals. In contrast to direct bromination by toxic elemental bromine or HBr, we developed an environmentally friendly system for oxybromination using hydrogen peroxide and ammonium bromide in the aqueous phase under mild temperature and near neutral conditions over a SBA-15 supported sulfated zirconia (SZ) catalyst. The ready availability of the catalyst and the nearly neutral aqueous solution are the salutary features of this approach. Bromination of aromatics with electron-withdrawing group took place readily, and bromoproducts were produced in moderate to excellent yields. A good to excellent para-selectivity was observed. The SZ/SBA-15 catalyst may be re-used several times without substantial loss of activity.

We also studied the catalytic activity of SZ which were supported on mesoporous SBA-15 silica or mesoporous SZ. On bromination silica supported sulfated zirconia (SZ/SBA-15) showed much better catalytic ability for bromination then self-supported SZ (m-SZ). Furthermore, we found the catalytic activity of SZ decreased as the calcinations temperature increased. The good catalytic performance of the SZ/SBA-15 materials was attributed to the well dispersed of sulfate groups to give sulfated silica-zirconia of with (1) very good redox property and (2) high strength and high density of acid sites.

Keywords

catalyticZrenvironmentally benign
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y03-40
Copyright
Copyright © Materials Research Society 2010

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