in acetonitrile 48 h; Ambient temperature;

1: 92 percent / 2 h / 190 - 210 °C 2: phosphoryl chloride / toluene / 3 h / Heating 3: 71 percent / sodium borohydride / 19 h / Ambient temperature 4: 51 percent / benzene / 48 h / Heating 5: 85 percent / acetonitrile / 48 h / Ambient temperature View Scheme

1: phosphoryl chloride / toluene / 3 h / Heating 2: 71 percent / sodium borohydride / 19 h / Ambient temperature 3: 51 percent / benzene / 48 h / Heating 4: 85 percent / acetonitrile / 48 h / Ambient temperature View Scheme

1: 71 percent / sodium borohydride / 19 h / Ambient temperature 2: 51 percent / benzene / 48 h / Heating 3: 85 percent / acetonitrile / 48 h / Ambient temperature View Scheme

1: 92 percent / 2 h / 190 - 210 °C 2: phosphoryl chloride / toluene / 3 h / Heating 3: 71 percent / sodium borohydride / 19 h / Ambient temperature 4: 51 percent / benzene / 48 h / Heating 5: 85 percent / acetonitrile / 48 h / Ambient temperature View Scheme

1: 51 percent / benzene / 48 h / Heating 2: 85 percent / acetonitrile / 48 h / Ambient temperature View Scheme