Planar tetracoordinate carbon atoms hidden in the tetrameric aggregate of (2,6-dimethoxyphenyl)lithium.
The crystal structure of the (2,6-dimethoxyphenyl)lithium tetramer is comprised of two interacting dimer units. This is shown both by the somewhat greater C-Li distances between rather than within the dimers and by differences in the corresponding 13C-6Li coupling consts. of the tetramer in PhMe soln. While these dimer units fold as a result of their interaction, the local environment of C(ipso) approaches the planar tetracoordination predicted in 1981 for the isolated dimer on the basis of MNDO calcns.
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