In:
Angewandte Chemie, Wiley, Vol. 133, No. 42 ( 2021-10-11), p. 23061-23066
Abstract:
The synthesis and characterization of the bis(η 6 ‐benzene)lithium cation, the benzene metallocene of the lightest metal, is reported. The boron compound FmesBCl 2 [Fmes: 2,4,6‐tris(trifluoromethyl)phenyl] reacted with three molar equivalents of the lithio‐acetylene reagent Li‐C≡C‐Fmxyl [Fmxyl: 3,5‐bis(trifluoromethyl)phenyl] . Subsequent crystallization from benzene gave the [bis(η 6 ‐benzene)Li] + cation with the [{FmesB(‐C≡C‐Fmxyl) 3 } 2 Li] − anion. This parent [(arene) 2 Li] + cation shows an eclipsed arrangement of the pair of benzene ligands at the central lithium cation with uniform carbon‐lithium bond lengths. The corresponding [(η 6 ‐toluene) 2 Li] + and [(η 6 ‐durene) 2 Li] + containing salts were similarly prepared. The bis(arene)lithium cations were characterized by X‐ray diffraction, by solid‐state 7 Li MAS NMR spectroscopy and their bonding features were analyzed by DFT calculations.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v133.42
DOI:
10.1002/ange.202108376
Language:
English
Publisher:
Wiley
Publication Date:
2021
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