. 2009 May 22;14(5):1915–1926. doi: 10.3390/molecules14051915
© 2009 by the authors;
licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Scheme 1.
Preparation of silica bonded S-sulfonic acid (SBSSA).