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|Title:||Optical resolution and the stereoelectronic properties of chelating (±)-[(methylsulfinyl)methyl]diphenylphosphine|
|Authors:||Leung, P.-H. |
|Source:||Leung, P.-H.,Quek, G.H.,Lang, H.,Liu, A.M.,Mok, K.F.,White, A.J.P.,Williams, D.J.,Rees, N.H.,McFarlane, W. (1998-05-21). Optical resolution and the stereoelectronic properties of chelating (±)-[(methylsulfinyl)methyl]diphenylphosphine. Journal of the Chemical Society - Dalton Transactions (10) : 1639-1643. ScholarBank@NUS Repository.|
|Abstract:||Optical resolution of the asymmetric chelating agent (±)-Ph2PCH2S(O)Me has been achieved via fractional crystallization of a pair of diastereomeric palladium(II) cationic complexes containing the sulfinyl-substituted ligand and ortho-metallated (S)-[1-(dimethylamino)ethyl]naphthalene. The X-ray structural analysis of the perchlorate salt of the less-soluble diastereomer confirmed that the sulfinyl-substituted phosphine co-ordinated to the palladium via phosphorus and oxygen with the non-co-ordinated sulfur having an R absolute configuration. An unusual electronic repulsion is observed between palladium and the non-bonded sulfur lone pair thus directing the methyl substituent on sulfur to a sterically unfavored axial position. Furthermore, a two-dimensional rotating frame Overhauser enhancement 1H NMR study of the complex in CDCl3 confirmed that this intramolecular electronic interaction outweighs the general steric considerations in solution. Optically pure (R)-(+)-Ph2PCH2-S(O)Me was displaced from the resolving palladium complex with 1,2-bis(diphenylphosphino)ethane.|
|Source Title:||Journal of the Chemical Society - Dalton Transactions|
|Appears in Collections:||Staff Publications|
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