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Titel: A Cyclic Iminoborane-NHC Adduct: Synthesis, Reactivity, and Bonding Analysis
VerfasserIn: Koner, Abhishek
Sergeieva, Tetiana
Morgenstern, Bernd
Andrada, Diego M.
Sprache: Englisch
Titel: Inorganic Chemistry
Bandnummer: 60
Heft: 18
Seiten: 14202-14211
Verlag/Plattform: ACS
Erscheinungsjahr: 2021
Freie Schlagwörter: Adducts
Aromatic Compounds
Boron
Carbene Compounds
Hydrocarbons
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Lewis-base coordinated iminoborane adducts, in contrast to their isoelectronic analogue imines, remain largely unexplored given the lack of efficient synthetic strategies for generating robust compounds. Herein, we report the preparation of a cyclic amino iminoborane carbene complex 2 obtained in quantitative yield by adding NHC to the 1,8-(trimethylsilyl)- aminonaphthalene complex of boron 1 to induce the elimination of trimethylsilyl chloride (TMSCl). The iminoborane-NHC adduct 2 shows unprecedented thermal stability both in the solid and solution phases, due to the rigid, pre-established geometry of the 1,8-diaminonaphthalene scaffold. Theoretical calculations reveal an exceptionally strong iminoborane-NHC bond as a consequence of the enhanced boron-center acidity in combination with the lower steric and electronic shielding. We show that the chemical bond can be understood as donor−acceptor interaction, leading to a different kind of electronic situation of the BN π-bond. The high conjugation between the pz-lone pair of the tricoordinated sp2 hybridized N atom and the BN π-system results in a particularly long BN double bond distance. Taking advantage of the pendant lone pair of the dicoordinated sp2 hybridized N atom, the iminoborane-NHC adduct gives access to NHC-stabilized borenium cation 3 through the reaction with trimethylsilyl triflate (Me3SiOTf) or to the gallium adduct 4 by reacting with GaCl3. Incorporating an iminoborane functional group into a π-conjugated system brings a new bonding situation for broadening the scope of BN-containing polyaromatic systems.
DOI der Erstveröffentlichung: 10.1021/acs.inorgchem.1c01583
URL der Erstveröffentlichung: https://pubs.acs.org/doi/10.1021/acs.inorgchem.1c01583
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-434121
hdl:20.500.11880/38924
http://dx.doi.org/10.22028/D291-43412
ISSN: 1520-510X
0020-1669
Datum des Eintrags: 8-Nov-2024
Bezeichnung des in Beziehung stehenden Objekts: Supporting Information
In Beziehung stehendes Objekt: https://pubs.acs.org/doi/suppl/10.1021/acs.inorgchem.1c01583/suppl_file/ic1c01583_si_001.pdf
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Guido Kickelbick
NT - Prof. Dr. David Scheschkewitz
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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