فهرس المقالات Methoxymethyl ethers حرية الوصول المقاله صفحة الملخص نص كامل 1 - Rice husk ash (RHA): A Highly efficient solid acid catalyst for the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers with CrO3 Farhad Shirini Masoumeh Abedini Mahnaz Shamsi-Sani Mohadeseh Seddighi