tributylphosphine; ammonium formate; tris(dibenzylideneacetone)dipalladium(0) chloroform complex in N,N-dimethyl-formamide T=70°C; 1 h;

1: carbonic acid dimethyl ester With lanthanum (III) nitrate * water; tri-n-octyl phosphine T=20°C; 2: 1-ethynyl-cyclohexan-1-ol 10 h; Molecular sieveReflux;

Yield given. Multistep reaction;