Synthesis and characterization of bulky cationic arylalkylaluminum compounds

Tomasz Kliś , Douglass R. Powell , Łukasz Wojtas , Rudolph J. Wehmschulte


ABSTRACT: The cationic m-terphenyl-substituted organoaluminum compounds [Dipp*AlEt][CH6B11Cl6] (3; Dipp* = 2,6-(2,6-i-Pr2C6H3)2C6H3), [DcpAlEt][CH6B11Cl6] (4; Dcp = 2,6-(2,6-Cl2C6H3)2C6H3), [Dipp*AlEt][CH6B11I6] (5), and [DcpAlEt][CH6B11I6] (6) have been obtained by ethide elimination through trityl or preferably silylium salts from the precursors Dipp*AlEt2 (1) and DcpAlEt2 (2). The crystal structures of compounds 35 reveal the presence of cationanion adducts involving two halides of the carborane anions, and the NMR spectroscopic data and solubility properties indicate such an interaction for 6. The interactions of the hexaiodocarborane anion with the [Dipp*AlEt]þ cation are stronger than those of the hexachlorocarborane anion. Interestingly, cation 3 3 3 anion contacts are preferred to intramolecular Al 3 3 3 Cl interactions in the Dcp species 4. Compound 4 forms the bisamine adduct [DcpAlEt(NH2t-Bu)2][CH6B11I6] (8) upon exposure to tBuNH2, and compounds 3 and 4 slowly catalyze the alkylation of benzene with 1-hexene. The compounds have been characterized by 1H, 13C, and 11B NMR spectroscopy and by X-ray crystallography in the case of 15, 7, and 8.
Author Tomasz Kliś ZChF
Tomasz Kliś,,
- Department Of Physical Chemistry
, Douglass R. Powell
Douglass R. Powell,,
, Łukasz Wojtas
Łukasz Wojtas,,
, Rudolph J. Wehmschulte
Rudolph J. Wehmschulte,,
Journal seriesOrganometallics, ISSN 0276-7333
Issue year2011
Keywords in Englishcationic aluminum compounds, carboranes
Internal identifier4153
Languageen angielski
om200120y.pdf 2.28 MB
Score (nominal)32
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2011 = 3.963 (2) - 2011=3.786 (5)
Citation count*17 (2015-06-30)
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