1.1: tetrahydrofuran / 1 h / 10 °C 2.1: N,N-dimethyl-formamide / 3 h / 20 °C / |Inert atmosphere 3.1: potassium carbonate / tetrahydrofuran / 24 h / 20 °C / |Inert atmosphere 3.2: 24 h / |Reflux; |Inert atmosphere 4.1: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / tetrachloromethane / 2 h / |Inert atmosphere; |Reflux 5.1: tetra(n-butyl)ammonium dichromate(VI) / chloroform / 10 h / |Inert atmosphere; |Reflux 6.1: boron tribromide / dichloromethane / 0.08 h / 0 °C / |Inert atmosphere 7.1: iron; calcium chloride / water; ethanol / 5 h / |Inert atmosphere; |Reflux 8.1: sodium hydroxide; oxygen / water; dimethyl sulfoxide / 24 h / 20 °C / |Inert atmosphere View Scheme

1.1: tetrahydrofuran / 1 h / 10 °C 2.1: N,N-dimethyl-formamide / 3 h / 20 °C / |Inert atmosphere 3.1: potassium carbonate / tetrahydrofuran / 24 h / 20 °C / |Inert atmosphere 3.2: 24 h / |Reflux; |Inert atmosphere 4.1: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / tetrachloromethane / 2 h / |Inert atmosphere; |Reflux 5.1: tetra(n-butyl)ammonium dichromate(VI) / chloroform / 10 h / |Inert atmosphere; |Reflux 6.1: boron tribromide / dichloromethane / 0.08 h / 0 °C / |Inert atmosphere 7.1: sodium hydroxide / water; dimethyl sulfoxide / 3 h / 20 °C / |Inert atmosphere 8.1: palladium 10 on activated carbon; hydrogen / ethanol / 6 h / 20 °C 8.2: 1 h / 0 °C / |Inert atmosphere View Scheme