6-Hydroxycarvotanacetone[2-methyl-5-(1-methylethyl)-6-hydroxycyclohex-2-en-1-one] has been isolated in small amounts from the essential oil of Laggera alata (D. Don) Sch. Bip. ex Oliv., although its absolute stereostructure has not yet been unequivocally established. A short synthesis of two diastereomers of 6-hydroxycarvotanacetone from (R)--carvone via regioselective epoxidation of its dienylsilyl ether is described.
(-)-Carvone (3) has been efficiently transformed into (-)-3β-hydroxycarvone (1), which is expected to be a useful synthon or chiral template in the synthesis of natural molecules. This short and efficient synthesis of compound 1 involves regioselective and stereoselective α-hydroxylation of carvone via the trimethylsilyl-dienyl-ether derivative.
The ring opening reaction of a wide range of mono-, di-and trisubstituted epoxides with the phenylselenide anion under PTC conditions provides a simple, mild and efficient method for preparation of b-hydroxy phenylselenides with high regio-and stereoselectivity in yields from 67 to 98%. The reactions are carried out in aqueous NaOH/ THF using aminoiminomethanesulfinic acid (thiourea dioxide, TDO) to generate sodium phenylselenide from diphenyldiselenide.
This paper describes the study of the preparation of Ti/Ti 1Àx Ce x O 2 electrodes using the Pechini method and their application for the electroreduction of nitrobenzene in aqueous acid medium. The electrodes were studied using X-ray diffraction, and scanning electron microscopy and it was found that the electrocatalytic properties are influenced by the microstructure and morphology of the electrodes. All doped electrodes presented an enhanced performance for nitrobenzene electroreduction when compared to pure TiO 2 . The Ti 0.995 Ce 0.005 O 2 electrode presented the best performance, with an increase of 58% in the aniline yield under galvanostatic electrolysis conditions.
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