4096-33-7Relevant articles and documents
Oxidation with the "O2 - H2O2 - Vauauium complex - Pyrazine-2-carboxylic acid" reagent 9. Oxidation of cyclohexene and decalin
Schuchardt,Guerreiro,Shul'pin
, p. 247 - 252 (2007/11/27)
The oxidation of cyclohexene with hydrogen peroxide catalyzed by a vanadium complex and pyrazine-2-carboxylic acid (PCA) in air results in the formation of cyclohex-2-enyl hydroperoxide as the main product and cyclohex-2-enol, cyclohex-2-enone, cyclohex-3-enyl hydroperoxide, cyclohex-3-enol, cyclohexanol, cyclohexane, and 1,2-epoxycyclohexane in lesser amounts. The composition of the products of oxidation of decalin isomers with the system in question is similar to those obtained in the photochemical oxidation with hydrogen peroxide in air and in the oxidation with air in the presence of anthraquinone. A proposed mechanism for the oxidation includes the initiation by hydroxyl radicals generated from hydrogen peroxide under the action of the V - PCA system.
Prostaglandin Endoperoxide Model Compounds. Part 2. Stereospecific Synthesis of Isomeric 5-Bromo-2,3-dioxabicycloheptanes and 2-Bromo-6,7-dioxabicyclooctanes
Bloodworth, A. J.,Eggelte Henny J.
, p. 3272 - 3278 (2007/10/02)
Cyclopent-3-enyl hydroperoxide (9) has been prepared from cyclopentadiene via hydroboration and autoxidation, and converted by bromination into trans-3,cis-4-dibromocyclopentyl hydroperoxide (10).Reaction of compound (10) with silver oxide has afforded endo-5-bromo-2,3-dioxabicycloheptane (11) (42percent), whereas treatment of compound (10) with silver trifluoroacetate has provided exo-5-bromo-2,3-dioxabicycloheptane (15) (6percent) and exo-5-trifluoroacetoxy-2,3-dioxabicycloheptane (16) (14percent).The exo-bromide (15) (11percent) has also been prepared from cyclopent-3-enyl bromide by trans-hydroperoxybromination and ring closure with silver oxide.The configurations of the peroxides have been confirmed by catalytic hydrogenation.Cyclohex-3-enyl hydroperoxide (26) has been prepared from anisole by a 5-step procedure ending with oxidation of N-cyclohex-3-enyl-N'-tosylhydrzide, and converted by bromination into a mixture of two diastereoisomeric 3,4-dibromocyclohexyl hydroperoxides.Treatment of the trans-3,cis-4-dibromide (27) with silver oxide has afforded endo-2-bromo-6,7-dioxabicyclooctane (29) (40percent), whereas reaction of the cis-3,trans-4-dibromide (28) with silver trifluoroacetate has provided exo-2-bromo-6,7-dioxabicyclooctane (30) (18percent).Treatment of compound (27) with silver trifluoroacetate yielded a 9:1 mixture of peroxides (30) and (29) (19percent), but compound (28) did not react with silver oxide.It is suggested that the silver oxide-induced dioxabicyclizations proceed by an SN2 mechanism whereas the silver trifluoroacetate reactions involve a bromonium ion intermediate.