Introduction of sulfonated rice husk ash as a highly efficient reusable catalyst for the protection of the hydroxyl group
الموضوعات : Iranian Journal of CatalysisFarhad Shirini 1 , Masoumeh Abedini 2 , Mahnaz Shamsi-Sani 3 , Mohadeseh Seddighi 4
1 - Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran.
2 - Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran.
3 - Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran.
4 - Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran.
الکلمات المفتاحية: Protection, Tetrahydropyranylation, Sulfonated rice husk ash, Trimethylsilylation, Methoxymethylation,
ملخص المقالة :
A mild, efficient and fast method for the trimethylsilyl (TMS), tetrahydropyranyl (THP) and methoxymethyl (MOM) protection of alcohols and phenols in the presence of sulfonated rice husk ash (RHA-SO3H) is reported. All reactions were performed at room temperature in high to excellent yields. All the products are separated and compared with authentic samples and/ or identified using different types of methods including FT-IR, 1H NMR and 13C NMR spectroscopy. Ease of the preparation and handling of the catalyst, heterogeneous reaction conditions, reusability of the catalyst, easy work-up procedure and short reaction times are the main advantages of this method, which make this procedure useful and attractive addition to the available methods.
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