| Título: | Cyano-stabilized triphenylphosphonium ylids |
| Autores: |
Castañeda, F. Bunton, Clifford A. Baggio, Ricardo Garland, María Teresa |
| Fecha: |
2009-07-01 2009-07-01 2007-01 |
| Publicador: | BLACKWELL PUBLISHING |
| Fuente: |
Ver documento |
| Tipo: | Artículo de Revista |
| Tema: |
Phosphorus ylides CRYSTAL-STRUCTURE |
| Descripción: | Crystalline cyano-stabilized triphenylphosphonium ylids with keto or ester groups give rise to an extended electronic delocalization. In methyl 2-cyano-2-(trimethylphosphonio)-ethenoate, Ph3P=C(CN)CO2CH3 or C22H18NO2P, (I), and 1-cyano-1-(trimethylphosphonio)prop-1-en-2-olate, Ph3P=C(CN)CO-CH3 or C22H18NOP, (II), the carbonyl groups are oriented toward the cationoid P atom. Bond lengths and angles, torsion angles and P center dot center dot center dot O contact distances are consistent with a dominant coplanar conformation where the molecular structures are the result of a balance between intra- and intermolecular interactions. The main interactions presented by cyano-ester (I) and cyano-keto (II) are intramolecular interactions between the carbonyl O and the P atoms. In addition, both compounds show other less important intramolecular interactions between the carbonyl O and phenyl H atoms, which could contribute to form a preferred conformation in the crystal structure. |
| Idioma: | Inglés |