Distinct Reactivity of Trimethylytterbium toward AlMe3 and GaMe3: Synthesis of Donor‐Stabilized Dimethylytterbium

Me3TACN (1,4,7‐trimethyl‐1,4,7‐triazacyclononane)‐stabilized trimethylytterbium was obtained via a salt‐metathesis protocol employing [(Me3TACN)YbCl3] and methyllithium. Complex [(Me3TACN)YbMe3] seems not to engage in redox chemistry with potassium graphite and is thermally quite stable in the solid...

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Bibliographic Details
Published in:Chemistry : a European journal 2023-04, Vol.29 (23), p.e202203824-n/a
Main Authors: Mortis, Alexandros, Maichle‐Mössmer, Cäcilia, Anwander, Reiner
Format: Article
Language:English
Subjects:
171Yb NMR spectroscopy
AlMe3
Chemistry
GaMe3
Ion pairs
Metathesis
reduction
Trivalent ions
ytterbium
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Summary:Me3TACN (1,4,7‐trimethyl‐1,4,7‐triazacyclononane)‐stabilized trimethylytterbium was obtained via a salt‐metathesis protocol employing [(Me3TACN)YbCl3] and methyllithium. Complex [(Me3TACN)YbMe3] seems not to engage in redox chemistry with potassium graphite and is thermally quite stable in the solid state. Treatment of trivalent [(Me3TACN)YbMe3] with 3 equiv. of AlMe3 afforded divalent tetramethylaluminate complex [(Me3TACN)Yb(AlMe4)2]. The reaction of [(Me3TACN)YbMe3] with GaMe3 in THF gave trivalent ion pair [(Me3TACN)YbMe2(thf)][GaMe4], which is susceptible to reduction with KC8. The thermally very labile divalent [(Me3TACN)YbMe(μ‐Me)]2 is the first discrete donor adduct of a divalent dimethyl rare‐earth‐metal complex. Donor‐stabilized dimethylytterbium: Readily available donor‐stabilized trimethylytterbium reacts with AlMe3 under reduction via a methyl radical pathway to divalent bis(tetramethylaluminato) ytterbium. Contrary to this, addition of GaMe3 affords trivalent adduct [(Me3TACN)YbMe2(μ‐Me)GaMe3], which reacts with KC8 in THF to the first donor‐stabilized dimethylytterbium complex.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.202203824