in benzene Irradiation (UV/VIS); irrdn. for 2 h 40 min with a 450 W medium pressure mercury lamp (290 to 330 nm), under Ar; extn. (aq. NaOH), dried (Na2SO4), evapd., crystn. from hexane, yields 9,10-phenanthraquinone;

in toluene byproducts: titanocenedichloride; (Ar), dichlorophenylborane added at -78°C to a soln. of Ti-complex, warmed slowly to room temp., stirred for 24 h, hexane added; filtered, concd., recrystd. (hexane); elem. anal.;

oxygen; trifluoroacetic acid

in toluene

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in tetrahydrofuran