Molybdenum-mediated N2-splitting and functionalization in the presence of a coordinated alkyne

A new [PCCP]-coordinated molybdenum platform comprising a coordinated alkyne was employed for the cleavage of molecular dinitrogen. The coordinated η2-alkyne was left unaffected during this reduction. DFT calculations suggest that the reaction proceeds via an initially generated terminal N2-complex,...

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Main Authors: Wagner, Hannah (Author) , Wadepohl, Hubert (Author) , Ballmann, Joachim (Author)
Format: Article (Journal)
Language:English
Published: 07 October 2021
In: Angewandte Chemie. International edition
Year: 2021, Volume: 60, Issue: 49, Pages: 25804-25808
ISSN:1521-3773
DOI:10.1002/anie.202111325
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1002/anie.202111325
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202111325
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Author Notes:Hannah K. Wagner, Hubert Wadepohl, and Joachim Ballmann

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520 |a A new [PCCP]-coordinated molybdenum platform comprising a coordinated alkyne was employed for the cleavage of molecular dinitrogen. The coordinated η2-alkyne was left unaffected during this reduction. DFT calculations suggest that the reaction proceeds via an initially generated terminal N2-complex, which is converted to a dinuclear μ-(η1:η1)-N2-bridged intermediate prior to N−N bond cleavage. Protonation, alkylation and acylation of the resulting molybdenum nitrido complex led to the corresponding N-functionalized imido complexes. Upon oxidation of the N-acylated imido derivative in MeCN, a fumaronitrile fragment was built up via C−C coupling of MeCN to afford a dinuclear molybdenum complex. The key finding that the strong N≡N bond may be cleaved in the presence of a weaker, but spatially constrained C≡C bond contradicts the widespread paradigm that coordinated alkynes are in general more reactive than gaseous N2. 
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