Alkali metal (Li, Na, K, Rb, Cs) mediation in magnesium hexamethyldisilazide [Mg(HMDS)2] catalysed transfer hydrogenation of alkenes

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Gentner, Thomas X. and Kennedy, Alan R. and Hevia, Eva and Mulvey, Robert E. (2021) Alkali metal (Li, Na, K, Rb, Cs) mediation in magnesium hexamethyldisilazide [Mg(HMDS)2] catalysed transfer hydrogenation of alkenes. ChemCatChem, 13 (10). pp. 2371-2378. ISSN 1867-3880 (https://doi.org/10.1002/cctc.202100218)

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Abstract

Though s-block organometallics are indispensable tools in synthetic chemistry, their impact in homogeneous catalysis has been small compared to that for transition metals. Surprisingly, however, Group 1 and 2 compounds have recently been utilised in hydroelementation catalysis. For example, transfer hydrogenation of alkenes to alkanes has been catalysed by Group 2 (Ca, Sr, Ba) bis-hexamethyldisilazides (HMDS), though reactions failed with magnesium. Stimulated by the knowledge that alkali metals can mediate applications of other compounds, this study reports successful catalytic transfer hydrogenation of alkenes with magnesium bis-hexamethyldisilazide when combined with alkali metals in heterobimetallic complexes. By screening all Group 1 metals (Li-Cs), the efficiency of these catalyses gives an indication of the relative power of the synergistic effect exerted on magnesium by the alkali metal. The Cs-Mg partnership shows the best efficiency with styrene, while K-Mg works best with 1,1-diphenylethylene.

ORCID iDs

Gentner, Thomas X., Kennedy, Alan R. ORCID logoORCID: https://orcid.org/0000-0003-3652-6015, Hevia, Eva and Mulvey, Robert E. ORCID logoORCID: https://orcid.org/0000-0002-1015-2564;
  • Item type:Article
    ID code:75750
    Dates:
    Date
    Event
    19 May 2021
    Published
    9 March 2021
    Published Online
    8 March 2021
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:11 Mar 2021 10:19
    Last modified:18 Dec 2024 23:58
    URI:https://strathprints.strath.ac.uk/id/eprint/75750
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