lithium in tetrahydrofuran 0.25 h; Ambient temperature;

1: P-(phenyl)dibenzophosphole With lithium in tetrahydrofuran T=20°C; 5 h; 2: With 2-Chloro-2-methylpropane 0.25 h; 3: ethyl bromide T=20°C; 0.5 h;

1.1: 80 percent / lithium diethylamide / diethyl ether / 16 h / 20 °C 2.1: lithium / tetrahydrofuran / 5 h / 20 °C 2.2: tert-butyl chloride / 0.25 h 2.3: 0.5 h / 20 °C View Scheme

1: 81 percent / nickel(II) chloride / tetrahydrothiophene 1,1-dioxide / 23 h / Heating 2: 74.4 percent / lithium diethylamide / diethyl ether / 3 h / Heating 3: 1.) Na, NH3 (liq.) / 1) -70 deg C, 30 min; 2) diethyl ether, -33 deg C, 1.5 h View Scheme

24 h; Ambient temperature;