1: in toluene T=20°C; 0.5 h; 2: With sodium hydroxide in methanol; toluene T=20°C; 3 h;

in toluene byproducts: 1,5-cyclooctadiene, dibenzylideneacetone; under N2; toluene soln. of phosphine was added to toluene soln. of Pd(0)-complex (molar ratio was 1:4), after 1 h Pd(II)-complex was added (molar ratio phosphine:Pd(II)-complex was 2:1), mixt. was stirred for 4 h; soln. was evapd. to dryness, solid was washed with acetone, dried undervac.;