Details are given for the preparation of "uranocene," U(C8H8)2, from UC14 and CSH82-in THF. Uranocene reacts only slowly with water or acetic acid but decomposes with oxygen, bases, and strong acids. It does not undergo electrophilic substitutions or metallation reactions. Its chemistry is discussed in terms of a simple theory of the electronic structure that involves covalent interaction of the highest occupied e2u ligand MO's with metal fx yi and f(z= _ AO's.
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-
Spiro[cyclopropane-l,2 '-adamantane-1 '-ol] (6a). The synthesis of this compound follows essentially the procedure for the preparation of 13. Purification of the crude reaction product by chromatography on alumina and recrystallization from petroleum ether yields 70-80% of 6a: mp 192-194°( lit.8 mp 192-194°); ir (CCU) 3550, 3400, 3050, 1110, 1085, 1010, 975, 935 cm"1 2; nmr (CCU) 0.1 and 0.85 (2 g, 2.3 and 2, C3íU ring), 1.15 (broad s, 1), 1.75 (m, 6), 2.1 (m, 7); mass spectrum mje 178.
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