1: dicyclo-hexylphosphine With N,N,N',N',N'',N''-hexamethylphosphoric triamide; n-butyllithium in tetrahydrofuran; hexane T=25°C; 0.5 h; 2: 1,5-dihydro-benzo[e][1,3,2]dioxathiepine 3,3-dioxide in tetrahydrofuran; hexane T=-78 - 20°C; 1 h; 3: lithium diphenylphosphinide in tetrahydrofuran; hexane T=60°C; 3 h;

1.1: SOCl2 / CCl4 / 1.5 h / Heating 1.2: 72 percent / RuCl3*nH2O; NaIO4 / CCl4; acetonitrile; H2O / 1 h / 25 °C 2.1: BuLi; hexamethylphosphoramide / hexane; tetrahydrofuran / 0.5 h / 25 °C 2.2: hexane; tetrahydrofuran / 1 h / -78 - 20 °C 2.3: 65 percent / hexane; tetrahydrofuran / 3 h / 60 °C View Scheme