potassium tert-butylate in N,N-dimethyl-formamide T=50°C; 5 h;

in methanol; water Cu(OAc)2*H2O added to water and heated to just below boiling point, hotsoln. filtered into stirred H(tod) soln. in methanol, mixt. allowed to stand for 4 h; solid collected by filtration and washed with cold methanol, recrystn. from hexanes; elem. anal.;

urea in ethanol; water addn. of Cr-compd., org. compd. and urea to a mixt. of water and ethanol, stirring and heating under reflux for 20 h; cooling to room temp., addn. of water, extn. of obtained oil into hexane, filtn., solvent removal, sublimation of oil gives solid material, re-sublimation; elem. anal.;

NaOH in methanol; water to soln. of Ce(NO3)3*6H2O in methanol is added soln. of H(tod) in methanol, soln. stirred and aq. NaOH added until pH 7; mixt. added to separatory funnel: water and hexanes added and Ce(tod)4 extd. into org. phase, org. layer collected, filtered, solvent removed by rotary evapn.; elem. anal.;