sodium hydroxide; sodium dithionite in methanol T=50°C;

1: 93 percent / 30percent H2O2 / (2-NO2-C6H4)2Se2 / CH2Cl2 / Ambient temperature 2: 92 percent / 20percent aq. NaOH, NaO2SSO2Na / methanol / 50 °C View Scheme

1: 93 percent / NaH / dimethylformamide / 6 h / Ambient temperature 2: 93 percent / 30percent H2O2 / (2-NO2-C6H4)2Se2 / CH2Cl2 / Ambient temperature 3: 92 percent / 20percent aq. NaOH, NaO2SSO2Na / methanol / 50 °C View Scheme

Irradiationin the presence of oxygen; thermolysis at 185-190 deg C in a selaed tube, 8 min; Product distributionMechanism;