1: bis-diphenylphosphine With potassium tert-butylate in tetrahydrofuran T=20°C; 0.5 h; Inert atmosphere; 2: N,N-bis(2-bromoethyl)phenylamine in tetrahydrofuran T=0 - 20°C; 5 h; Inert atmosphere;

in tetrahydrofuran T=20°C; 1 h;

1.1: phosphorus tribromide / dichloromethane / 4.33 h / 0 - 20 °C / Inert atmosphere 2.1: potassium tert-butylate / tetrahydrofuran / 0.5 h / 20 °C / Inert atmosphere 2.2: 5 h / 0 - 20 °C / Inert atmosphere View Scheme