1: With palladium diacetate; tributyl-amine; caesium acetate; triphenylphosphine in N,N-dimethyl-formamide T=120°C; carbonylation; Hydrolysis; 3 h; 2: With sodium hydroxide in N,N-dimethyl-formamide; toluene T=20°C; 0.5 h;

caesium acetate; 1,8-diazabicyclo[5.4.0]undec-7-ene; triphenylphosphine; palladium diacetate in N,N-dimethyl-formamide Heating;

1,8-diazabicyclo[5.4.0]undec-7-ene; triphenylphosphine; palladium diacetate in N,N-dimethyl-formamide T=125°C; 3 h;

caesium acetate; 1,8-diazabicyclo[5.4.0]undec-7-ene; triphenylphosphine; palladium diacetate in N,N-dimethyl-formamide Heating;