1: 1.) hydrogen, 2.) sodium nitrite / 1.) palladium/10percent on charcoal / 1.) water, 2.) 1 h 2: 1.) triphenylphosphine, 2.) sodium nitrite, sulfuric acid / 1.) dioxane, 90 min, 2.) 2 h View Scheme

N,N-dimethyl-formamide; trichlorophosphate T=90°C; 1 h;

hydrogen; palladium on activated charcoal in water

1: 1.) hydrogen, 2.) sodium nitrite / 1.) palladium/10percent on charcoal / 1.) water, 2.) 1 h 2: 1.) triphenylphosphine, 2.) sodium nitrite, sulfuric acid / 1.) dioxane, 90 min, 2.) 2 h View Scheme