- NMR spectroscopic data of some 1-alkoxy-2,2-di(carbonyl, carboxyl, cyano)-substituted ethylenes
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The 1H-13C NMR shifts as well as 1H and 13C coupling constants of 14 alkoxymethylene malonic acid and acetoacetic acid derivatives and two alkoxymethylene acetylacetones are reported. The 17O NMR spectra have been recorded for six of them. The long-range coupling 3J(H-C=C-CR) has been used for determining the stereochemistry of the double bond. Copyright
- Hametner, Christian,Cernuchova, Petra,Milata, Viktor,Vo-Thanh, Giang,Loupy, Andre
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p. 171 - 173
(2007/10/03)
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- Process for the preparation of alkoxyalkylidenemalonic acid esters
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A process for the preparation of alkoxyalkylidenemalonic acid esters. The reaction is catalyzed by easily separable, insoluble aluminum silicates.
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- Method for the preparation of alkoxymethylene compounds of acetic esters and substituted acetic esters
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Disclosed is a method for preparation of alkoxymethylene compounds, especially methoxymethylene compounds, from substituted or unsubstituted acetic acid alkyl esters, especially methyl esters, from the corresponding hydroxymethylene compounds or their alkali salts, by reaction with excess alkanol, especially methanol, in the presence of HCl and a water-binding agent. Preferred are water-binding agents which form stable reaction products with water.
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- FACILE SYNTHESIS OF THE CARBOCYCLIC ANALOGUE OF β-RIBOFURANOSYLMALONATE, NEW SYNTHON FOR CARBOCYCLIC C-NUCLEOSIDE FORMATION BY RETROGRADE ALDOL C-C BOND FISSION
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A new carbocyclic C-nucleoside precursor, the carbocyclic analogue of β-ribofuranosylmalonate, has been synthesized through Diels-Alder addition of cyclopentadiene to dimethyl acetoxymethylenemalonate, followed by retrograde C-C bond fission under reductive conditions.Keywords- carbocyclic C-nucleoside; carbocyclic β-ribofuranosylmalonate; Diels-Alder adduct; cyclopentadiene; dimethyl acetoxymethylenemalonate; retrograde aldol reaction; sodium borohydride
- Katagiri, Nobuya,Haneda, Toru,Kaneko, Chikara
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p. 4875 - 4878
(2007/10/02)
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- SYNTHESE ET REACTIVITE D'OXYCYCLOPROPANES ELECTROPHILES
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"Electrophilic oxycyclopropanes" 4 to 6 have been prepared starting from olefins 7.Ring opening of these cyclopropanes occurs under very smooth conditions (DMSO, room temperature).A push-pull type system is then also a powerful driving force with regard to the C-C bond cleavage in cyclopropanes.
- Abdallah, Hassan,Gree, Rene,Carrie, Robert
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p. 4339 - 4346
(2007/10/02)
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