1.1: oxalyl dichloride / N,N-dimethyl-formamide; dichloromethane / 1 h / 20 °C / |Inert atmosphere 2.1: trifluorormethanesulfonic acid; trimethyl orthoformate / methanol; nitromethane / 2 h / 100 °C / |Inert atmosphere 3.1: bis-triphenylphosphine-palladium(II) chloride; tetraethylammonium chloride / N,N-dimethyl-formamide / 3 h / 100 °C / |Inert atmosphere 3.2: 1 h / 20 °C / |Inert atmosphere View Scheme

With  3-chloro-benzenecarboperoxoic acid in  dichloromethane  

Multi-step reaction with 3 steps 1: sodium acetate; hydroxylamine hydrochloride / ethanol / 2 h / 80 °C / |Inert atmosphere2: 1,2-dichloro-benzene / 1.5 h / 180 °C / |Inert atmosphere3: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 5 h / 20 °C / |Inert atmosphere  

Multi-step reaction with 2 steps 1: 1,2-dichloro-benzene / 1.5 h / 180 °C / |Inert atmosphere2: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 5 h / 20 °C / |Inert atmosphere  

With  oxalyl dichloride; N,N-dimethyl-formamide in  dichloromethane