allenyl tributylstannane; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran 0.5 h; Heating;

1: 1) conc. HCl, 2) pyridine, 4-(dimethylamino)pyridine / 1) CH2Cl2, 0 deg C, 2) 1 h, room temp. 2: 15 percent / Pd(PPh3)4 / tetrahydrofuran / 0.5 h / Heating View Scheme

tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran 0.5 h; Heating;