Lithium and Potassium Complexes with dbn- and dbu-Based Enamido Phosphine Ligands: Syntheses and Applications
Langer J, Grams S, Puchta R (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 2017
Pages Range: 2671-2681
Journal Issue: 20
DOI: 10.1002/ejic.201700305
Abstract
The phosphines 6-diphenylphosphino-1,8-diazabicyclo[5.4.0]undec-7-ene (dbuPH) and 7-diphenylposphino-1,5-diazabicyclo[4.3.0]non-5-ene (dbnPH), containing amidine subunits, were successfully deprotonated by n-butyllithium or benzylpotassium. In the presence of Et2O or THF, the well-defined complexes [{Li(dbnP)(Et2O)}2] (1), [{Li(dbuP)(Et2O)}2] (2), [{K(dbnP)(THF)}∞] (3b) and [{K(dbuP)(THF)2}2] (4) were obtained, while in the absence of such donors, polymeric [{K(dbnP)}∞] (3a) was formed. These alkali-metal derivatives are useful precursors for salt-metathesis reactions, and they allow the transfer of the enamido phosphine ligands to appropriate transition metals, as demonstrated by the syntheses of the new rhodium complexes [Rh(dbnP)(cod)] (5) and [Rh(dbuP)(cod)] (6). The reaction of 1 and 2 with Ph2PCl underlined the ambident character of dbnP– and dbuP– as nucleophiles and led to the new diphosphines dbn(PPh2)2 (two isomers C-7 and N-7) and dbu(PPh2)2 (N-8), in which either the carbon or the nitrogen atom of the former enamido moiety was substituted.
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APA:
Langer, J., Grams, S., & Puchta, R. (2017). Lithium and Potassium Complexes with dbn- and dbu-Based Enamido Phosphine Ligands: Syntheses and Applications. European Journal of Inorganic Chemistry, 2017(20), 2671-2681. https://doi.org/10.1002/ejic.201700305
MLA:
Langer, Jens, Samuel Grams, and Ralph Puchta. "Lithium and Potassium Complexes with dbn- and dbu-Based Enamido Phosphine Ligands: Syntheses and Applications." European Journal of Inorganic Chemistry 2017.20 (2017): 2671-2681.
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