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Triphenylarsonium ethylide

EPOXIDES Dimethylsulfoxonium methylide. Hydrogen peroxide. Hydrogen pcroxide-Triethyl orthoacctatc. I crmonophosphoric acid. Silica gcL Trifluoromethanesulfonic anhydride. Triphenylarsonium ethylide. [Pg.474]

Triphenylarsonium ethylide. trans-Epoxides can be prepared stereoselec-tively via arsonium ylides under special conditions (10,445). A simpler method involves transylidation of a phosphonium ylide to an arsonium ylide (equation I).2... [Pg.351]

Dialkylamino-aryloxosulfonium alkylides may be employed for enantioselective epoxidation if the ylide with its chiral sulfur center is resolved into its enantiomeric form, " An enantioselective oxirane is obtained by means of a chiral phase-transfer catalyzed procedure with dimethylsulfonium methylide. The utilization of arsonium ylides was reported some time ago. ° A highly stereoselective synthesis of trans-epoxides with triphenylarsonium ethylide has recently been described.Optically active arsonium ylide has been used in the asymmetric synthesis of diaryloxiranes. ... [Pg.54]

Triphenylarsonium ethylide (1). Mol. wt. 334.30, decomposes above —20°. Since triphenylarsine is moderately toxic, the reagent should be handled in a hood. Preparation ... [Pg.494]

See other pages where Triphenylarsonium ethylide is mentioned: [Pg.665]    [Pg.665]   
See also in sourсe #XX -- [ Pg.351 ]

See also in sourсe #XX -- [ Pg.445 ]



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