- Active Metals from Potassium-Graphite. Iron-Graphite as a New Debrominating Agent of vic-Dibromoalkanes and of α-Bromo Ketones
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Iron-graphite (Fe-Gr), easily prepared by reduction of FeCl3 with potassium-graphite (C8K) in tetrahydrofuran, is conveniently used for the stereospecific debromination of vic-dibromoalkanes to alkenes and for the reductive debromination of α-bromo ketones to ketones in high yields.The latter reaction proceeds via Fe(II) enolates, which undergo deuteration, condensation, or O-silylation by reaction respectively with D2O, heptanal, or chlorotrimethylsilane.Moreover, the reaction of α,α'-dibromo ketones with Fe-Gr leads to 2-oxyallyl cations which can be trapped by suitable electron-rich olefins (enamines) or dienes (furan).
- Savoia, Diego,Tagliavini, Emilio,Trombini, Claudio,Umani-Ronchi, Achille
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p. 876 - 879
(2007/10/02)
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- SUR L'OBTENTION HAUTEMENT REGIO- ET STEREOSELECTIVED'ENOXYSILANES PAR ACTION DU BIS(TRIMETHYLSILYL)ACETAMIDE EN MILIEU HMPT SUR LESS DERIVES CARBONYLES ENOLISABLES
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The authors describe a new and general method for the preparation of enoxysilanes by silylation of enolizable aldehydes and ketones by use of bis(trimethylsilyl)acetamide in HMPT, in the presence of very small quantities of sodium metal(or another basic a
- Dedier, James,Gerval, Pierre,Frainnet, Emile
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p. 183 - 198
(2007/10/02)
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