potassium in tetrahydrofuran under Ar; to a soln. of benzocyclooctatetraene potassium was added; mixt. stirred for 48 h, added to a soln. of UCl4 and refluxed for 2 days; evapn., washing a residue with hexane, extn. (THF);

hydrogen; palladium on activated charcoal in ethyl acetate P=760 Torr; Ambient temperature;