n-butyllithium in tetrahydrofuran T=-78°C; t-BuLi, Et2O; Title compound not separated from byproducts;

in tetrahydrofuran T=-78°C; Title compound not separated from byproducts;

in diethyl ether T=-78°C; Title compound not separated from byproducts;

1: 93 percent / diethyl ether / 0.5 h / 20 °C 2: 86 percent / Et3N / CH2Cl2 / 1 h / 20 °C 3: 83 percent / [(CF3)2C(Me)O]2Mo[CHCMe2Ph][N-2,6-diisopropylphenyl)] / benzene / 24 h / 20 °C 4: π-allylpalladium chloride dimer; tetrabutylammonium fluoride / tetrahydrofuran / 60 h / 20 °C View Scheme

in diethyl ether T=-78°C; Title compound not separated from byproducts;

2: CrO3, H2SO4 / acetone / 0 °C 3: 87 percent Chromat. / tetrahydrofuran / -78 °C View Scheme

With  acetic acid 14 h;