OICC Press Iranian Journal of Catalysis 2345-4865 5 3 2024 02 03 Rice husk ash (RHA): A Highly efficient solid acid catalyst for the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers with CrO3 EN Farhad Shirini Department of Chemistry, College of Science, University of Guilan, Rasht, Iran 0000-0002-7204-5000 Masoumeh Abedini Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran. Mahnaz Shamsi-Sani Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran. Mohadeseh Seddighi Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, Iran. Journal Article 2024 02 03 A mild, efficient and fast method for the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers to their corresponding carbonyl compounds using CrO3 in the presence of rice husk ash (RHA) is reported. All reactions were performed at room temperature in high to excellent yields. A new, efficient and green catalyst, heterogeneous reaction conditions, easy work-up of the products and high reaction rates are the main advantages of this method.