carbon monoxide; methyl 2-iodobenzoate; copper; zinc; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran P=760 Torr; -78 deg C, 2h; room temp., 1 h; 60 deg C, 6 h; Further byproducts given;

copper; zinc; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran P=760 Torr; -78 deg C, 2h; room temp., 1 h; 60 deg C, 6 h; Further byproducts given;

in diethyl ether