Dérivés doublement liés de l'étain et de l'antimoine : stannènes, stannaallènes, stibènes et stibaallènes >Sn=C<, Sn=C=C<,-Sb=C

Abstract : This thesis is devoted to the study of doubly-bonded derivatives of antimony -Sb=C< and -Sb=C=X (X = C, P) and tin >Sn=C< and >Sn=C=X (X = C, P)
In the field of antimony, some dihalostibanes and many precursors of stibenes -Sb=C<, stibaallenes -Sb=C=C< and phosphastibaallenes -Sb=C=P- have been synthesized. In order to obtain stable compounds of these types, the choice of subtituents is difficult: it is necessary to use extremely bulky groups, but however not too much in order to not prevent the coupling between the carbon and antimony moieties.
A four-membered ring 1,3-distibacyclobutane has been obtained and evidenced by mass and NMR spectrometry.

In the field of tin, the stable stannene Tip2Sn=CR2 (Tip = 2,4,6-triisopropylphenyl, CR2 = 2,7-di-tert-butylphenyl) has been prepared and stabilized owing to a large steric hindrance both on tin and carbon atoms. Its physicochemical characteristics prove it presents an heteroalkenic structure. It appeared highly reactive, particularly towards carbonyl compounds and dienes.
Many precursors of tin allenic species have been obtained and characterized by various physicochemical methods. A distannirane obtained by a cycloaddition of the stannaallene and the stannylene issued of its decomposition has been synthesized.
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Submitted on : Thursday, December 18, 2008 - 10:47:00 AM
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R. El Ayoubi. Dérivés doublement liés de l'étain et de l'antimoine : stannènes, stannaallènes, stibènes et stibaallènes >Sn=C<, Sn=C=C<,-Sb=C. Chimie. Université Paul Sabatier - Toulouse III, 2008. Français. ⟨tel-00348211⟩

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