in N,N-dimethyl-formamide T=20°C; electrolysis, oth. solvent, var. cathodes; Product distribution;

1: 1,2-bis(phosphino)benzene With n-butyllithium in tetrahydrofuran; hexane T=0 - 20°C; 1.5 h; Inert atmosphere; 2: 1,3,2-dioxathiepane 2,2-dioxide in tetrahydrofuran; hexane T=0 - 20°C; 2 h; Inert atmosphere; 3: With n-butyllithium T=0 - 20°C; Inert atmosphere;

1: 1,2-bis(phosphino)benzene With n-butyllithium in tetrahydrofuran; hexane T=20°C; 1.5 h; 2: 1,3,2-dioxathiepane 2,2-dioxide; (4S,7S)-4,7-dimethyl-1,3,2-dioxathiepane 2,2-dioxide in tetrahydrofuran; hexane T=20°C; 1 h; 3: With n-butyllithium in tetrahydrofuran; hexane T=20°C; Further stages. Title compound not separated from byproducts.;