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Enamine synthesis by the Horner-Wittig reaction

✍ Scribed by N.L.J.M. Broekhof; F.L. Jonkers; A. van der Gen

Publisher
Elsevier Science
Year
1979
Tongue
French
Weight
249 KB
Volume
20
Category
Article
ISSN
0040-4039

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✦ Synopsis

Horner-Wittig reaction aldehydes can be converted into their homologous ensmines by with ?&morpholinomethyl diphenylphosphine oxide (2.

Among the various methods that are used for the homologation of csrbonyl compounds, Wittig and Horner-Wittlg reactions with a-heterosubstituted ylides occupy a prominent position.

A multitude of phosphonlum salts, phosphonate esters and phosphine oxides, substituted at the a-carbon atom with aryloxy', alkoq l-3 , aryl-and alkylsulphinyl 2,4,5 , sulphony16 and phenyl-seleno7 groups, have been described for this purpose. Reaction of the corresponding ylides with aldehydes and ketones, followed by hydrolysis of the (thio or seleno) enolethers, provides

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Synthesis of Tetrastilbenylmethanes by W
Synthesis of Tetrastilbenylmethanes by Wittig−Horner Reactions
✍ Soungkyoo Kim; Peter Seus; Herbert Meier 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 122 KB 👁 1 views

## Abstract The all‐(__E__)‐configured tetrastilbenylmethanes **3a**−**e** and **5a**,**b** can be obtained by fourfold Wittig−Horner reactions. The tetrahedral arrangement of these compounds guarantees independent stilbenoid chromophores with a high chromophore density. Apart from (__E__)/(__Z__)