Chemo-, regio- and stereo-selective aerial oxidation of limonene to the endo-1,2-epoxide over Mn(Salen)-sulfonated SBA-15
| Title | Chemo-, regio- and stereo-selective aerial oxidation of limonene to the endo-1,2-epoxide over Mn(Salen)-sulfonated SBA-15 |
| Publication Type | Journal Article |
| Year of Publication | 2006 |
| Authors | Saikia, L, Srinivas, D, Ratnasamy, P |
| Journal | Applied Catalysis A-General |
| Volume | 309 |
| Issue | 1 |
| Pagination | 144-154 |
| Date Published | JUL |
| Type of Article | Article |
| ISSN | 0926-860X |
| Keywords | aerial oxidation of limonene, catalysis by Mn(Salen) complexes, chemo-, immobilized Mn Schiff base complexes, Mesoporous molecular sieves, Mukaiyama-type oxidation, regio- and stereo-selective epoxidation, sulfonic acid-functionalized SBA-15 |
| Abstract | Mn(Salen) complexes immobilized on sulfonic acid-functionalized SBA-15 molecular sieves (SBA-15-pr-SO3-Mn(Salen)) catalyze the Mukaiyama-type oxidation of R-(+)-limonene selectively to the 1,2-epoxide with molecular oxygen at 298 K (Salen = N,N-ethylenebis(salicylidenaminato)). The endo-diastereomer is formed with a diasteromeric excess of 39.8%. This catalyst exhibited higher catalytic activity than ``neat'' Mn(Salen) complexes directly supported on SBA-15 or zeolite-Y. A change in the oxidation state of Mn from +3 in the ``neat'' complex to +2 when immobilized on the sulfonated surface is a probable cause for the observed enhancement of catalytic activity. A part of the Mn complexes was leached out of the solid phase during the reaction. (c) 2006 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.apcata.2006.05.011 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 4.012 |