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Studies on the Wittig Reaction (VIII). Stereoselectivity of Diphenyl Allylic Phosphonium Ylids in Wittig Reaction

✍ Scribed by Wenfang, Huang; Jun, Zhu; Wenjing, Xiao; Yanneng, Denc

Book ID
121492452
Publisher
Taylor and Francis Group
Year
1989
Tongue
English
Weight
313 KB
Volume
46
Category
Article
ISSN
1042-6507

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Co-operative ortho-effects on the Wittig reaction. Interpretation of stereoselectivity in the reaction of ortho-halo-substituted benzaldehydes and benzylidenetriphenylphosphoranes
✍ Eoin C Dunne; Γ‰amonn J Coyne; Peter B Crowley; Declan G Gilheany πŸ“‚ Article πŸ“… 2002 πŸ› Elsevier Science 🌐 French βš– 87 KB

The E/Z ratios of the stilbenes 1 formed in the Wittig reaction of ortho-halo substituted benzyltriphenylphosphonium salts 2 and benzaldehydes 3 were determined. It was found that there is a co-operative effect of one ortho-halo group on each of the two reacting partners which increases Z-selectivit