The structure of the potassium salt of a cyclooctatetraene dianion has been determined. As predicted by the Hiickel theory this 10t electron system is aromatic with eightfold molecular symmetry and average C-C bond lengths of 1.407 (6) A. Yellow air-sensitive crystals of potassium diglyme bis(l,3,5,7-tetramethylcyclooctatetraene) dianion, [K((CH3OCH2CH2)20)]2[C8H4(CH3)4], crystallize in space group FI (C,1) with a =9 .757 (3), b = 10.026 (4), c = 8.793 (3) A, a = 97.15 (1)°, ß = 112.35 (1)°, and y = 109.95 (1)°w ith pcalcd = 1.16 g cm-3 for Z = 1. All atoms, including hydrogen atoms, have been located and their positions and thermal parameters refined by full-

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