Inorganica Chimica Acta p. 44 - 52 (2011)
Update date:2022-08-04
Topics:
Adams
Araneda
Morales
Chavez
Manriquez
Mac-Leod Carey
Katir
Castel
Rivière
Rivière-Baudet
Dahrouch
Gatica
Polyalkyl-(or chloropolyalkyl)-s-indacenyl anion radicals were obtained from the organodilithium derivatives of the corresponding substituted-1,5- dihydro-s-indacenes by three different methods: (i) UV photolysis, (ii) oxidation by a ferrocenium salt, (iii) single electron transfer reaction from an electron rich olefin. The last reaction (iii) involves transient formation of an unstable polyalkyl-lithio-s-indacenyl imidazolidinium salt. The same salt, obtained by another way by reacting 1,3-dimethylimidazolidinium chloride with the polyalkyl-1,5-dilithio-s-indacene, also leads to the corresponding lithium polyalkyl-s-indacenyl anion radical. All lithium polyalkyl-s-indacenyl anion radicals studied were characterized from their ESR spectra. They present a characteristic symmetrical spin distribution. On the contrary a Rhodium-COD polyalkyl-s-indacene radical presents a non symmetrical spin distribution.
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