Abstract
Reaction of 9-bromoanthracene with magnesium in diethylether and crystallization of the resulting white precipitate from an ethylbenzene/dibutylether mixture yields colourless, air- and moisture-sensitive crystals of dimeric anthracenylmagnensiumbromide-di-butylether. The crystal structure determination (monoclinic, P2 1/ c, Z = 2) proves that two antracenylmagnesiumbromide dibutylether subunits are connected by a planar, centrosymmetric and nearly quadratic four-membered ring. The magnesium centres are each surrounded tetrahedrally distorted by the anthracenyl substituent, two bromide ligands and the dibutylether solvate molecule. The anthracenyl anion shows significant structural changes relative to the hydrocarbon anthracene, especially around the magnesium-substituted ring position 9, which according to a search in the Cambridge Structural Database can be traced to an increased charge density at this centre.
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