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Title: Experimental and computational evidence of the biradical structure and reactivity of titanium(IV) enolates
Author: Heras, Carlos
Gómez-Palomino, A.
Romea, Pedro
Urpí Tubella, Fèlix
Bofill i Villà, Josep M.
Moreira, Ibério de Pinho Ribeiro
Keywords: Lligands
Estructura electrònica
Reactivitat (Química)
Electronic structure
Reactivity (Chemistry)
Issue Date: 7-Sep-2017
Publisher: American Chemical Society
Abstract: Quantum chemical calculations have unveiled the unexpected biradical character of titanium(IV) enolates from N-acyl oxazolidinones and thiazolidinethiones. The electronic structure of these species therefore involves a valence tautomerism consisting of an equilibrium between a closed shell (formally Ti(IV) enolates) and an open shell, biradical, singlet (formally Ti(III) enolates) electronic states, whose origin is to be basically found in changes of the Ti−O distance. Spectroscopic studies of the intermediate species lend support to such a model, which also turns out to be crucial for a better understanding of the overall reactivity of titanium(IV) enolates. In this context, a thorough computational analysis of the radical addition of titanium(IV) enolates from N-acyl oxazolidinones to TEMPO has permitted us to suggest an entire mechanism, which accounts for the experimental details and the diastereoselectivity of the process. All together, this evidence highlights the relevance of biradical intermediates from titanium(IV) enolates and may be a useful contribution to the foundations of a more insightful comprehension of the structure and reactivity of titanium(IV) enolates.
Note: Versió postprint del document publicat a:
It is part of: Journal of Organic Chemistry, 2017, vol. 82, num. 17, p. 8909-8916
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ISSN: 0022-3263
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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