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Synlett 2011(19): 2819-2822
DOI: 10.1055/s-0031-1289860
DOI: 10.1055/s-0031-1289860
LETTER
© Georg Thieme Verlag
Stuttgart ˙ New York
Unique Salt Effect on the High Yield Synthesis of Acid-Labile Terpene Oxides Using Hydrogen Peroxide under Acidic Aqueous Conditions
Further Information
Received
18 August 2011
Publication Date:
09 November 2011 (online)
Publication History
Publication Date:
09 November 2011 (online)
Abstract
Acid-labile epoxides such as α-pinene oxide are (effectively) synthesized in high yield from the epoxidation of terpenes with aqueous H2O2 catalyzed by Na2WO4, [Me(n-C8H17)3N]HSO4, and PhP(O)(OH)2 in the presence of Na2SO4 as an auxiliary additive under organic solvent-free conditions at ambient temperature. Origin of the salt effect is considered that the addition of a saturated amount of Na2SO4 to aqueous H2O2 strongly inhibited the undesired hydrolysis of the acid-labile epoxide products, despite the highly acidic reaction conditions.
Key words
oxidation - catalysis - epoxides - terpenoids - green chemistry
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