Spanish Sepiolite Clay as a New Heterogeneous Catalyst for the Tetrahydropyranylation of Alcohols and Phenols

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• Chemical analysis: SiO2 62. 0, MgO 23. 9, Al2O3 1. 7, Fe2O3 0. 5, CaO 0. 5, K2O 0. 6 and Na2O 0. 3%.
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