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• W2016354893 abstract "Abstract Reacting 2-butyne with the cobalt stannylene complexes [CpR(C2H4)CoSn{CH{Si(CH3)3}2}2] RH (5), Me5 (6) affords different cyclotrimerization products depending on the Cp ligand used. For the CpR (RH) derivative 5, reaction with 2-butyne is exclusively intermolecular, resulting in the formation of a 5:4:1 mixture of a 20e sandwich complex [(η5−Cp)Co(η6−C6Me6)], free hexamethylbenzene (hmb), and free stannylene [Sn{CH(SiMe3)2}2]. Replacing Cp against Me5Cp affords only trace amounts of the 20e sandwich complex [(η5-Me5Cp)Co(η6-C6Me6)], no free hmb and stannylene. The main product of the reaction is the cobalt-stannacyclopentadiene complex 8 which is formed via cycloaddition of two alkyne molecules and an SnR2 (CH(SiMe3)2) fragment. Crystalline 8 is characterized by single-crystal structure analysis which reveals a cobalt bonded stanna-cyclopentadiene ring ligand with a distorted tetrahedrally coordinated Sn atom and an η4 coordinated cobalt atom. Electrochemistry coupled with electron paramagnetic resonance spectroscopy and extended Huckel calculations shows that the Co(I) complex 8 undergoes reversibly one-electron oxidation to the corresponding Co(II) monocation [8]−, whereas further oxidation to the Co(III) congener [8]2− is followed by chemical complications." @default.
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• W2016354893 title "Synthesis, structure, spectroelectrochemical and theoretical investigations of Formation of a cobalt complexed stannacycle via a mixed alkyne-stannylene cycloaddition reaction" @default.
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