1: Im'CH2Im' With n-butyllithium in tetrahydrofuran; hexane T=-80 - -45°C; 0.5 h; 2: Diphenylphosphinemethane chloride in tetrahydrofuran; hexane T=-70 - 20°C;

1.1: 95 percent / n-Bu4NCl hydrate; aq. KOH / toluene / 14 h / 20 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -80 - -45 °C 2.2: 85 percent / tetrahydrofuran; hexane / -70 - 20 °C View Scheme

1.1: 83 percent / KOH; hydrazine hydrate / 4 h / 120 - 150 °C 2.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -80 - -45 °C 2.2: 85 percent / tetrahydrofuran; hexane / -70 - 20 °C View Scheme