1: bis-n-butylaminodiphenylphosphonium bromide With n-butyllithium; para-iodoanisole in tetrahydrofuran; hexane T=-50°C; Dehydrobromination; metallation; 0.5 h; 2: α,α-diphenylacetyl chloride in tetrahydrofuran; hexane T=-50°C; Dehydrochlorination; aza-Wittig reaction; 0.0833333 h;

in tetrahydrofuran T=-50 - 20°C; Dehydrochlorination; aza-Wittig reaction; 1 h;

phosphorus pentachloride; benzene Behandeln des Reaktionsprodukts mit Triaethylamin in Aether;

acetone; sodium iodide

in diethyl ether