sodium 1.) EtOH2.) ether, cooling, 4 h; 20 deg C, 12 h; Yield given;

1: With palladium diacetate; caesium carbonate; di-(1-adamantyl)-n-butylphosphine in toluene T=55°C; 0.5 h; Inert atmosphere; 2: With carbon monoxide in toluene T=85°C; 18 h; Inert atmosphere; Reagent/catalyst;