Skip to Main content Skip to Navigation
Journal articles

Controlled nucleophilic activation of different sites in [Mo 2Cp2L2(μ-SMe)2(μ-L′)] + cations (L = ButNC, xylNC, CO; L′ = SMe or PPh2)

Abstract : The thiolato-bridged binuclear molybdenum complexes [Mo2Cp 2L2(μ-SMe)2(μ-L′)]Y (Cp = η5-C5H5; L′ = SMe, L = Bu tNC (1a), xylNC (1b) or CO (3); L′ = PPh2, L = ButNC (16); Y = BF4, Cl) react with the anionic reagents NaBH4, NaBD4, LiR (R = Me, Bun), R′MgCl (R′ = Me, Pri, Bun or Ph). The products are unsubstituted (5, 7) or substituted (8-12) η4-cyclopentadiene derivatives, [Mo2(η5-C5H 5)(η4-C5H5R)L 2(μ-SMe)3] (L = xylNC, CO), or μ-formimidoyl dinuclear products, [Mo2Cp2L2(μ-SMe) 2(μ-L′)(μ-CHNR)] (L′ = SMe, L = ButNC (4) or xylNC (6); L′ = PPh2, L = ButNC (17)). Since the reduced dinuclear species [Mo2Cp2(CO) 2(μ-SMe)2] and the related oxo-compound [Mo 2Cp2(CO)(O)(μ-SMe)2] are sometimes isolated as minor products, the anionic reagent can play a secondary role as a reductant in these reactions in addition to its main role as a nucleophile. The electronic properties of the donor carbon atoms of the cyclopentadienyl rings and of the terminal ligands L, together with the nature of the anionic reagent, are the dominant factors controlling selective formation of 4-12 and 17. Tetrafluoroboric acid reacts with the substituted cyclopentadiene derivatives 9, 11 and 12 to form new functionalised cyclopentadienyl derivatives, [Mo 2(η5-C5H5)(η5- C5H4R)(CO)2(μ-SMe)3](BF 4) (R = Me (13), Bun (14) or Ph (15)). New complexes have been characterised by spectroscopic and chemical methods, supplemented for 5, 6 and 12 by X-ray diffraction studies at 100 K. © 2005 Elsevier B.V. All rights reserved.
Document type :
Journal articles
Complete list of metadatas

https://hal.univ-brest.fr/hal-01763754
Contributor : Nicolas Renard <>
Submitted on : Wednesday, April 11, 2018 - 1:42:52 PM
Last modification on : Friday, July 10, 2020 - 4:24:02 PM

Identifiers

Citation

Nolwenn Cabon, François Pétillon, Pierre Yves Orain, Philippe Schollhammer, Jean Talarmin, et al.. Controlled nucleophilic activation of different sites in [Mo 2Cp2L2(μ-SMe)2(μ-L′)] + cations (L = ButNC, xylNC, CO; L′ = SMe or PPh2). Journal of Organometallic Chemistry, Elsevier, 2005, 690 (21-22), pp.4583-4601. ⟨10.1016/j.jorganchem.2005.07.034⟩. ⟨hal-01763754⟩

Share

Metrics

Record views

149