Preparation of Silica-Bonded S-Sulfonic Acid: A Recyclable Catalyst for the Synthesis of Bis-Indolylmethanes |
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| Authors: | Khodabakhsh Niknam Dariush Saberi Mojtaba Baghernejad |
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| Institution: | 1. Department of Chemistry, Faculty of Sciences , Persian Gulf University , Bushehr, Iran;2. Islamic Azad University , Gachsaran Branch , Gachsaran, Iran |
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| Abstract: | Silica bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform. Silica-bonded S-sulfonic acid, as a reusable solid acid catalyst, was used for the condensation reactions of indole with carbonyl compounds at ambient temperature. Tetra-(indolyl)methanes were also obtained by the condensation reaction of indole with dialdehyde compounds. Silica bonded S-sulfonic acid was recovered and reused. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. |
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| Keywords: | Bis(indolyl)methanes carbonyl compounds indole silica-bonded S-sulfonic acid tetra(indolyl)methanes |
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