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IJC-B Vol.46B(02) [February 2007] >


Title: Stereoselectivity of the Wittig reaction in two-phase system
Authors: Busafi, Saleh Al
Rawahi, Waffa Al
Keywords: Stereoselectivity
Wittig reaction
Benzyltriphenyl¬phosphonium chloride
Stilbene
Issue Date: Feb-2007
Publisher: CSIR
IPC CodeInt. Cl.‚Āł C07C
Abstract: The Wittig reaction of benzyltriphenylphosphonium chloride with aliphatic and aromatic aldehydes has been investigated, respectively, in two-phase solvent system (dichloromethane / water) in the presence of sodium hydroxide. Both, the effect of the size of aliphatic aldehydes and the effect of substitution on benzaldehyde to the cis/trans ratios have been studied. It has been found that the use of aliphatic aldehydes in Wittig reaction gives higher ratio of trans alkene isomer. However, when aromatic aldehyde is used, the ratio of the cis alkene isomer is found to be higher than that of the trans isomer. In addition, the electronic nature of substituents (electron-donating group versus electron-withdrawing group) causes some changes in the cis/trans ratio of the product stilbene.
Page(s): 370-374
ISSN: 0376-4699
Source:IJC-B Vol.46B(02) [February 2007]

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