Harder, Sjoerd; Boersma, Jaap; Brandsma, Lambert; Van Heteren, Albert; Kanters, Jan A.; Bauer, Walter; Schleyer, Paul v. R.:

Planar tetracoordinate carbon atoms hidden in the tetrameric aggregate of (2,6-dimethoxyphenyl)lithium.

In: Journal of the American Chemical Society (J.Am.Chem.Soc.), Jg. 110 (1988) ; Nr. 23, S. 7802-7806
ISSN: 0002-7863
Zeitschriftenaufsatz / Fach: Chemie
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.