Comparing and taming the reactivity of HWE and Wittig reagents with cyclic hemiacetals
β Scribed by Jokin Carrillo; Anna M. Costa; Mireia Sidera; Jaume Vilarrasa
- Book ID
- 113929804
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- French
- Weight
- 436 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0040-4039
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Wittig reagents 1a,b react with dicyanomethylene derivatives of fluorenone (3) and xanthone (4) to give the corresponding phosphoranylidenecyclobutylidene adducts 6a, 6b, 9a, and 9b. On the other hand, the reaction of Wittig-Horner reagents (2) with the same nitriles 3 and 4 afforded the respective