Ylures sans sel,evolution en phosphoranes et equilibre ylure ⇌ phosphorane : I Synthese et structure |
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Authors: | R. Burgada Y.O. El Khoshnieh Y. Leroux |
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Affiliation: | Laboratoire de Chimie des Organo-éléments, E.R.A. 825 Tour 44, 4 place Jussíeu, 75230 Paris Cédex 05, France |
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Abstract: | Synthesis of new salt-free ylids , to , , , , and and phoiphoranes , , , , , to by addition of a trivalent phosphorus compound (phosphites and amino-phosphines ) to with dimethyl acetylencedicartboxylate in presence of a protic trapping reagent are described. The results are consistent with trapping of carbanionic species. In relation with the. cyclic of acyclic structure of the triivalent phosphorus compound and the protic trapping reagent ie : methanol, phenol, carboxylic acid, etc.., several pathways are involved. Clearly), three phenomena are shown : one can obtain an ylid via a phosphorane or conversely a phosphorane via an ylid or an equilibrium Phoiphorane ? ylid. Results are dealing with thermodynamic or kinetically controlled reactions. |
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