One-pot synthesis at room temperature of epoxides and linalool derivative pyrans in monolacunary Na(7)PW(11)O(39)-catalyzed oxidation reactions by hydrogen peroxide

在室温下,以过氧化氢为氧化剂,在单空位Na(7)PW(11)O(39)催化的氧化反应中,一步合成环氧化物和芳樟醇衍生物吡喃

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Abstract

In this work, we describe a new one-pot synthesis route of valuable linalool oxidation derivatives (i.e., 2-(5-methyl-5-vinyltetrahydrofuran-2-yl propan-2-ol) (1a)), 2,2,6-trimethyl-6-vinyltetrahydro-2H-pyran-3-ol (1b) and diepoxide (1c), using a green oxidant (i.e., hydrogen peroxide) under mild conditions (i.e., room temperature). Lacunar Keggin heteropolyacid salts were the catalysts investigated in this reaction. Among them, Na(7)PW(11)O(39) was the most active and selective toward oxidation products. All the catalysts were characterized by FT-IR, TG/DSC, BET, XRD analyses and potentiometric titration. The main reaction parameters were assessed. Special attention was dedicated to correlating the composition and properties of the catalysts and their activity.

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