Alkyl backbone variations in common β-diketiminate ligands and applications to N -heterocyclic silylene chemistry
We report the extension of the common β-diketimine proligand class, nacnacH (HC(RCNAr) H), where R is an alkyl group such as Et or iPr, plus Ph, and Ar is a sterically demanding aryl substituent such as Dip = 2,6-diispropylphenyl, Dep = 2,6-diethylphenyl, Mes = 2,4,6-trimethylphenyl or mesityl, Xyl...
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Veröffentlicht in: | Dalton transactions : an international journal of inorganic chemistry 2024-06, Vol.53 (23), p.9887-9895 |
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Sprache: | eng |
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Zusammenfassung: | We report the extension of the common β-diketimine proligand class,
nacnacH (HC(RCNAr)
H), where R is an alkyl group such as Et or iPr, plus Ph, and Ar is a sterically demanding aryl substituent such as Dip = 2,6-diispropylphenyl, Dep = 2,6-diethylphenyl, Mes = 2,4,6-trimethylphenyl or mesityl, Xyl = 2,6-dimethylphenyl,
one-pot condensation procedures. When a condensation reaction is carried out using the chemical dehydrating agent PPSE (polyphosphoric acid trimethylsilylester), β-diketiminate phosphorus(V) products such as (
nacnac)PO
can also be obtained, which can be converted to the respective proligand
nacnacH
alkaline hydrolysis. The
nacnacH proligands can be converted to their alkali metal complexes with common methods and we have found that deprotonation of
nacnacH is significantly more sluggish than that of related β-diketimines with smaller backbone alkyl groups. The basicity of the
nacnac
anions can play a role in the success of their salt metathesis chemistry and we have prepared and structurally characterised the
nacnac-derived silicon(II) compounds (
nacnac)SiBr and (
nacnac')Si, where
nacnac' is the deprotonated variant MeCHC(NDip)CHC(NDip)Et. |
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ISSN: | 1477-9226 1477-9234 |
DOI: | 10.1039/d4dt01298d |