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- W1995892115 abstract "L'identification des configurations Z et E des alkyl-2 éthylidène-3 cyclopropanes portant, en position 1 sur le cycle, un groupement fonctionnel (cétone, ester, alcool) est réalisée par voie chimique d'une part et par l'étude en RMN des glissements induits par un chélate d'europium, Eu(dpm)3, d'autre part. Les attributions de structure permettent d'affirmer que la migration de la double liaison des esters, cétones, alcools cyclopropéniques en milieu basique, conduit préférentiellement aux dérivés cyclopropéniques de configuration E; la stéréosélectivité peut atteindre 90%. La prototropie est, par ailleurs, régiospécifique et stéréospécifique par rapport au cycle. The identification of E- and Z-2-alkyl-3-ethylidenecyclopropane having a functional group (ketone, ester, alcohol) at C-1 of the ring, is realized by chemical means and by NMR induced shifts using Eu(dpm)3. These structure assignments show that the cyclopropene ester, ketone, alcohol double bond migration in basic media leads preferentially to the E-configuration; the stereoselectivity may reach 90%. Moreover, the prototropy is regiospecific and stereospecific compared to the ring." @default.
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- W1995892115 date "1981-01-01" @default.
- W1995892115 modified "2023-10-17" @default.
- W1995892115 title "Identification des configurations Z et E en série cyclopropylidénique. Stéréosélectivité de la migration exocyclique de la double liaison cyclopropénique en milieu basique" @default.
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- W1995892115 doi "https://doi.org/10.1016/s0040-4020(01)98975-6" @default.
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