Zusammenfassung

Radicals and biradicals can easily be obtained when Si(IV) compds. are reduced and stabilized by the Lewis base cyclic(alkyl)(amino)carbene (cAAC = C(CH2)(CMe2)2N-Dipp, Dipp = 2,6-i-Pr2C6H3) featuring strong s-donor and p-acceptor properties. To obtain the cAAC-stabilized monoradicals with halogen and alkyl substituents at the Si(IV) atoms, the Ar substituent (Ar = o-C6H4NMe2) was employed to act as a side-arm N donor ligand. The resulting monoradicals ArSiCl2(cAAC) (4) and ArSiRCl(cAAC) (R = Me 5; Et 6) were isolated by the redn. of ArSiCl2 (1) and ArSiRCl2 (R = Me 2; Et 3) with KC8 in the presence of cAAC with a strict ratio of 1:1:1. The three room-temp. stable radicals were kept for at least 3 mo in the solid state under dry N2 atmosphere without decompn. All the compds. were fully characterized by liq. injection field desorption/ionization-mass spectrometry, ESR spectroscopy, UV/visible spectroscopy, elemental anal., and single-crystal x-ray crystallog. studies. on SciFinder(R)

Links und Ressourcen

DOI:
10.1021/acs.organomet.9b00041
BibTeX-Schlüssel:
Li.2019
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