1: diethyl 4-(hydrazinosulfonyl)benzyl phosphonate / o-xylene / Inert atmosphere; Reflux 2: pyridine; 1,10-phenanthroline; potassium tert-butylate / 0.18 h / 20 - 160 °C / Inert atmosphere; Microwave irradiation View Scheme

K2S; copper diacetate in N,N-dimethyl-formamide T=140°C; 24 h; Schlenk techniqueInert atmosphere;

1: 1-bromo-2-(2-phenylethenyl)benzene With magnesium in tetrahydrofuran 2 h; Reflux; 2: N,N-dimethyl-formamide in tetrahydrofuran T=20°C; optical yield given as percent de;