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2,4-Diene-1,6-diones and 2-Acyl-3-cyclopenten-1-ols by Double Friedel-Crafts Acylation of Tricarbonyl(diene)iron Complexes

✍ Scribed by Directeur de Recherche au CNRS Michel Franck-Neumann; Dr. Madjid Sedrati; Dr. Mohamed Mokhi


Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
235 KB
Volume
25
Category
Article
ISSN
0044-8249

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✦ Synopsis


A further aspect emerges from a comparison of the Si-Si bonds in 1, 2, and 4 : if one assumes that the bonds of the Si, ring in 1 are arched, then the "analog calculation" with a model kit'" using the Si-Si distance of 251 pm gives a value of 265 pm for the linear bond. This would then be the "normal" length of an Si-Si bond between two atoms with /err-butyl groups as substituents.


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6-(Triphenylphosphonio-3Ј-cyclopentadienyl)-2,3,5-trihalocyclohexa-2,5-diene-1,4-diones (2) are a new class of phosphorus containing dyes that behave as weak bases. Mono-protonation occurs at the cyclopentadiene ring leading to three isomers as assessed by NMR. The kinetics of the protonation were s