pyridine T=0 - 20°C; 3 h;

1: glycerol; concentrated sulfuric acid; hydrochloric acid 2: sodium acetate View Scheme

sodium acetate

1: bromine; pyridine / tetrachloromethane / 3 h / 0 - 90 °C 2: potassium carbonate; methanol / water / 2 h / 20 °C 3: potassium carbonate / acetone / 20 °C View Scheme

pyridine; bromine in tetrachloromethane 2 h; Heating / reflux;

1: bromine; pyridine / tetrachloromethane / 3 h / 0 - 90 °C 2: potassium carbonate; methanol / water / 2 h / 20 °C View Scheme

1: bromine; pyridine / tetrachloromethane / 3 h / 0 - 90 °C 2: potassium carbonate; water / methanol / 2 h / 20 °C 3: potassium carbonate / acetone / 20 °C 4: potassium tert-butylate; tris-(dibenzylideneacetone)dipalladium(0); 4a,9a-dihydro-9,9-dimethyl-4,5-bis(diphenylphosphino)-xanthene / toluene / 8.16 h / 100 °C / |Inert atmosphere 5: palladium 10 on activated carbon; hydrogen / methanol / 8 h / 60 °C / 760.05 Torr View Scheme