carbon monoxide in not given High Pressure; 100 °C, 50 atm;;

reaction at 50 atm;;

anthracene; magnesium in tetrahydrofuran byproducts: magnesium acetylacetonate, cyclooctene; Sonication; 20 min addn. time, react. temp. 66°C, ultrasonic bath (35 kH), one-step-variation of the method from H. Boennemann and W. Brijoux, Aspects of Homogeneous Catalysis, Vol. 5, Reidel, Dordrecht, 1984, pp. 75-196;

in not given Irradiation (UV/VIS); irradiation with UV;;

(Z,Z)-1,5-cyclooctadiene in further solvent(s) Irradiation (UV/VIS); solvent was ethylcyclohexane, reflux under N2 for 18 h; cooled in dry ice/ethanol bath, filtered, recrystd. twice from pentane,sublimation in vac. at 70°C (0.1 mmHg);

C5H5Na in tetrahydrofuran; water; pentane under N2, CoBr2*DME, NaCp, CoCp2 and COD mixed in THF in molar ratio of2/2.06/0.5/1.16 (CoCp2 added at -80°C prior to NaCp), warmed to room temp. during 3 h, evapd., pentane ext. passed through Al2O3/4percent H2O and CuCl powder; concd., cooled to -80°C, CpCoCOD filtered off; CuCl washed with water, CoCp2(1+) pptd. with BPh4(1-) from aq. soln., filtered off; pentane-insol. residue treated with water, Co and CoO mixt. filtered, Co(2+) determined complexometrically;

C5H5Na in tetrahydrofuran under N2, soln. of CoBr2*DME in THF cooled to -78°C, soln. of NaCp in THF added dropwise with stirring, COD added at -80°C, allowed to warm to 20°C during 3 h;

iso-propylmagnesium bromide in diethyl ether ambient temp., presence of i-C3H7MgBr;;

in tetrahydrofuran addn. of COD to soln. of cobaltocene (16.1mmol) in THF; slow dropping of soln. of K(THF)1.5(Co(COD)2) (8.05mmol) in THF at 50°C. with stirring; further stirring for 4 hours;; evapn. of solvent; dissolving of ppt. in n-pentane, filtration and concn.; crystn. -20°C; sucking off; washing with cold n-pentane and drying in vac.; recrystn. from n-heptane; detn. by m.p. and 1H-NMR;;

iso-C3H7MgBr in tetrahydrofuran excess of C8H12, 0°C;;